Root/
1 | /* |
2 | * Copyright (C) 2000 Jens Axboe <axboe@suse.de> |
3 | * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com> |
4 | * Copyright (C) 2006 Thomas Maier <balagi@justmail.de> |
5 | * |
6 | * May be copied or modified under the terms of the GNU General Public |
7 | * License. See linux/COPYING for more information. |
8 | * |
9 | * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and |
10 | * DVD-RAM devices. |
11 | * |
12 | * Theory of operation: |
13 | * |
14 | * At the lowest level, there is the standard driver for the CD/DVD device, |
15 | * typically ide-cd.c or sr.c. This driver can handle read and write requests, |
16 | * but it doesn't know anything about the special restrictions that apply to |
17 | * packet writing. One restriction is that write requests must be aligned to |
18 | * packet boundaries on the physical media, and the size of a write request |
19 | * must be equal to the packet size. Another restriction is that a |
20 | * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read |
21 | * command, if the previous command was a write. |
22 | * |
23 | * The purpose of the packet writing driver is to hide these restrictions from |
24 | * higher layers, such as file systems, and present a block device that can be |
25 | * randomly read and written using 2kB-sized blocks. |
26 | * |
27 | * The lowest layer in the packet writing driver is the packet I/O scheduler. |
28 | * Its data is defined by the struct packet_iosched and includes two bio |
29 | * queues with pending read and write requests. These queues are processed |
30 | * by the pkt_iosched_process_queue() function. The write requests in this |
31 | * queue are already properly aligned and sized. This layer is responsible for |
32 | * issuing the flush cache commands and scheduling the I/O in a good order. |
33 | * |
34 | * The next layer transforms unaligned write requests to aligned writes. This |
35 | * transformation requires reading missing pieces of data from the underlying |
36 | * block device, assembling the pieces to full packets and queuing them to the |
37 | * packet I/O scheduler. |
38 | * |
39 | * At the top layer there is a custom make_request_fn function that forwards |
40 | * read requests directly to the iosched queue and puts write requests in the |
41 | * unaligned write queue. A kernel thread performs the necessary read |
42 | * gathering to convert the unaligned writes to aligned writes and then feeds |
43 | * them to the packet I/O scheduler. |
44 | * |
45 | *************************************************************************/ |
46 | |
47 | #include <linux/pktcdvd.h> |
48 | #include <linux/module.h> |
49 | #include <linux/types.h> |
50 | #include <linux/kernel.h> |
51 | #include <linux/compat.h> |
52 | #include <linux/kthread.h> |
53 | #include <linux/errno.h> |
54 | #include <linux/spinlock.h> |
55 | #include <linux/file.h> |
56 | #include <linux/proc_fs.h> |
57 | #include <linux/seq_file.h> |
58 | #include <linux/miscdevice.h> |
59 | #include <linux/freezer.h> |
60 | #include <linux/mutex.h> |
61 | #include <linux/slab.h> |
62 | #include <scsi/scsi_cmnd.h> |
63 | #include <scsi/scsi_ioctl.h> |
64 | #include <scsi/scsi.h> |
65 | #include <linux/debugfs.h> |
66 | #include <linux/device.h> |
67 | |
68 | #include <asm/uaccess.h> |
69 | |
70 | #define DRIVER_NAME "pktcdvd" |
71 | |
72 | #if PACKET_DEBUG |
73 | #define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args) |
74 | #else |
75 | #define DPRINTK(fmt, args...) |
76 | #endif |
77 | |
78 | #if PACKET_DEBUG > 1 |
79 | #define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args) |
80 | #else |
81 | #define VPRINTK(fmt, args...) |
82 | #endif |
83 | |
84 | #define MAX_SPEED 0xffff |
85 | |
86 | #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1)) |
87 | |
88 | static struct pktcdvd_device *pkt_devs[MAX_WRITERS]; |
89 | static struct proc_dir_entry *pkt_proc; |
90 | static int pktdev_major; |
91 | static int write_congestion_on = PKT_WRITE_CONGESTION_ON; |
92 | static int write_congestion_off = PKT_WRITE_CONGESTION_OFF; |
93 | static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */ |
94 | static mempool_t *psd_pool; |
95 | |
96 | static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */ |
97 | static struct dentry *pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */ |
98 | |
99 | /* forward declaration */ |
100 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev); |
101 | static int pkt_remove_dev(dev_t pkt_dev); |
102 | static int pkt_seq_show(struct seq_file *m, void *p); |
103 | |
104 | |
105 | |
106 | /* |
107 | * create and register a pktcdvd kernel object. |
108 | */ |
109 | static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd, |
110 | const char* name, |
111 | struct kobject* parent, |
112 | struct kobj_type* ktype) |
113 | { |
114 | struct pktcdvd_kobj *p; |
115 | int error; |
116 | |
117 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
118 | if (!p) |
119 | return NULL; |
120 | p->pd = pd; |
121 | error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name); |
122 | if (error) { |
123 | kobject_put(&p->kobj); |
124 | return NULL; |
125 | } |
126 | kobject_uevent(&p->kobj, KOBJ_ADD); |
127 | return p; |
128 | } |
129 | /* |
130 | * remove a pktcdvd kernel object. |
131 | */ |
132 | static void pkt_kobj_remove(struct pktcdvd_kobj *p) |
133 | { |
134 | if (p) |
135 | kobject_put(&p->kobj); |
136 | } |
137 | /* |
138 | * default release function for pktcdvd kernel objects. |
139 | */ |
140 | static void pkt_kobj_release(struct kobject *kobj) |
141 | { |
142 | kfree(to_pktcdvdkobj(kobj)); |
143 | } |
144 | |
145 | |
146 | /********************************************************** |
147 | * |
148 | * sysfs interface for pktcdvd |
149 | * by (C) 2006 Thomas Maier <balagi@justmail.de> |
150 | * |
151 | **********************************************************/ |
152 | |
153 | #define DEF_ATTR(_obj,_name,_mode) \ |
154 | static struct attribute _obj = { .name = _name, .mode = _mode } |
155 | |
156 | /********************************************************** |
157 | /sys/class/pktcdvd/pktcdvd[0-7]/ |
158 | stat/reset |
159 | stat/packets_started |
160 | stat/packets_finished |
161 | stat/kb_written |
162 | stat/kb_read |
163 | stat/kb_read_gather |
164 | write_queue/size |
165 | write_queue/congestion_off |
166 | write_queue/congestion_on |
167 | **********************************************************/ |
168 | |
169 | DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200); |
170 | DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444); |
171 | DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444); |
172 | DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444); |
173 | DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444); |
174 | DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444); |
175 | |
176 | static struct attribute *kobj_pkt_attrs_stat[] = { |
177 | &kobj_pkt_attr_st1, |
178 | &kobj_pkt_attr_st2, |
179 | &kobj_pkt_attr_st3, |
180 | &kobj_pkt_attr_st4, |
181 | &kobj_pkt_attr_st5, |
182 | &kobj_pkt_attr_st6, |
183 | NULL |
184 | }; |
185 | |
186 | DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444); |
187 | DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644); |
188 | DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644); |
189 | |
190 | static struct attribute *kobj_pkt_attrs_wqueue[] = { |
191 | &kobj_pkt_attr_wq1, |
192 | &kobj_pkt_attr_wq2, |
193 | &kobj_pkt_attr_wq3, |
194 | NULL |
195 | }; |
196 | |
197 | static ssize_t kobj_pkt_show(struct kobject *kobj, |
198 | struct attribute *attr, char *data) |
199 | { |
200 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; |
201 | int n = 0; |
202 | int v; |
203 | if (strcmp(attr->name, "packets_started") == 0) { |
204 | n = sprintf(data, "%lu\n", pd->stats.pkt_started); |
205 | |
206 | } else if (strcmp(attr->name, "packets_finished") == 0) { |
207 | n = sprintf(data, "%lu\n", pd->stats.pkt_ended); |
208 | |
209 | } else if (strcmp(attr->name, "kb_written") == 0) { |
210 | n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1); |
211 | |
212 | } else if (strcmp(attr->name, "kb_read") == 0) { |
213 | n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1); |
214 | |
215 | } else if (strcmp(attr->name, "kb_read_gather") == 0) { |
216 | n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1); |
217 | |
218 | } else if (strcmp(attr->name, "size") == 0) { |
219 | spin_lock(&pd->lock); |
220 | v = pd->bio_queue_size; |
221 | spin_unlock(&pd->lock); |
222 | n = sprintf(data, "%d\n", v); |
223 | |
224 | } else if (strcmp(attr->name, "congestion_off") == 0) { |
225 | spin_lock(&pd->lock); |
226 | v = pd->write_congestion_off; |
227 | spin_unlock(&pd->lock); |
228 | n = sprintf(data, "%d\n", v); |
229 | |
230 | } else if (strcmp(attr->name, "congestion_on") == 0) { |
231 | spin_lock(&pd->lock); |
232 | v = pd->write_congestion_on; |
233 | spin_unlock(&pd->lock); |
234 | n = sprintf(data, "%d\n", v); |
235 | } |
236 | return n; |
237 | } |
238 | |
239 | static void init_write_congestion_marks(int* lo, int* hi) |
240 | { |
241 | if (*hi > 0) { |
242 | *hi = max(*hi, 500); |
243 | *hi = min(*hi, 1000000); |
244 | if (*lo <= 0) |
245 | *lo = *hi - 100; |
246 | else { |
247 | *lo = min(*lo, *hi - 100); |
248 | *lo = max(*lo, 100); |
249 | } |
250 | } else { |
251 | *hi = -1; |
252 | *lo = -1; |
253 | } |
254 | } |
255 | |
256 | static ssize_t kobj_pkt_store(struct kobject *kobj, |
257 | struct attribute *attr, |
258 | const char *data, size_t len) |
259 | { |
260 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; |
261 | int val; |
262 | |
263 | if (strcmp(attr->name, "reset") == 0 && len > 0) { |
264 | pd->stats.pkt_started = 0; |
265 | pd->stats.pkt_ended = 0; |
266 | pd->stats.secs_w = 0; |
267 | pd->stats.secs_rg = 0; |
268 | pd->stats.secs_r = 0; |
269 | |
270 | } else if (strcmp(attr->name, "congestion_off") == 0 |
271 | && sscanf(data, "%d", &val) == 1) { |
272 | spin_lock(&pd->lock); |
273 | pd->write_congestion_off = val; |
274 | init_write_congestion_marks(&pd->write_congestion_off, |
275 | &pd->write_congestion_on); |
276 | spin_unlock(&pd->lock); |
277 | |
278 | } else if (strcmp(attr->name, "congestion_on") == 0 |
279 | && sscanf(data, "%d", &val) == 1) { |
280 | spin_lock(&pd->lock); |
281 | pd->write_congestion_on = val; |
282 | init_write_congestion_marks(&pd->write_congestion_off, |
283 | &pd->write_congestion_on); |
284 | spin_unlock(&pd->lock); |
285 | } |
286 | return len; |
287 | } |
288 | |
289 | static const struct sysfs_ops kobj_pkt_ops = { |
290 | .show = kobj_pkt_show, |
291 | .store = kobj_pkt_store |
292 | }; |
293 | static struct kobj_type kobj_pkt_type_stat = { |
294 | .release = pkt_kobj_release, |
295 | .sysfs_ops = &kobj_pkt_ops, |
296 | .default_attrs = kobj_pkt_attrs_stat |
297 | }; |
298 | static struct kobj_type kobj_pkt_type_wqueue = { |
299 | .release = pkt_kobj_release, |
300 | .sysfs_ops = &kobj_pkt_ops, |
301 | .default_attrs = kobj_pkt_attrs_wqueue |
302 | }; |
303 | |
304 | static void pkt_sysfs_dev_new(struct pktcdvd_device *pd) |
305 | { |
306 | if (class_pktcdvd) { |
307 | pd->dev = device_create(class_pktcdvd, NULL, MKDEV(0, 0), NULL, |
308 | "%s", pd->name); |
309 | if (IS_ERR(pd->dev)) |
310 | pd->dev = NULL; |
311 | } |
312 | if (pd->dev) { |
313 | pd->kobj_stat = pkt_kobj_create(pd, "stat", |
314 | &pd->dev->kobj, |
315 | &kobj_pkt_type_stat); |
316 | pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue", |
317 | &pd->dev->kobj, |
318 | &kobj_pkt_type_wqueue); |
319 | } |
320 | } |
321 | |
322 | static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd) |
323 | { |
324 | pkt_kobj_remove(pd->kobj_stat); |
325 | pkt_kobj_remove(pd->kobj_wqueue); |
326 | if (class_pktcdvd) |
327 | device_unregister(pd->dev); |
328 | } |
329 | |
330 | |
331 | /******************************************************************** |
332 | /sys/class/pktcdvd/ |
333 | add map block device |
334 | remove unmap packet dev |
335 | device_map show mappings |
336 | *******************************************************************/ |
337 | |
338 | static void class_pktcdvd_release(struct class *cls) |
339 | { |
340 | kfree(cls); |
341 | } |
342 | static ssize_t class_pktcdvd_show_map(struct class *c, |
343 | struct class_attribute *attr, |
344 | char *data) |
345 | { |
346 | int n = 0; |
347 | int idx; |
348 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
349 | for (idx = 0; idx < MAX_WRITERS; idx++) { |
350 | struct pktcdvd_device *pd = pkt_devs[idx]; |
351 | if (!pd) |
352 | continue; |
353 | n += sprintf(data+n, "%s %u:%u %u:%u\n", |
354 | pd->name, |
355 | MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev), |
356 | MAJOR(pd->bdev->bd_dev), |
357 | MINOR(pd->bdev->bd_dev)); |
358 | } |
359 | mutex_unlock(&ctl_mutex); |
360 | return n; |
361 | } |
362 | |
363 | static ssize_t class_pktcdvd_store_add(struct class *c, |
364 | struct class_attribute *attr, |
365 | const char *buf, |
366 | size_t count) |
367 | { |
368 | unsigned int major, minor; |
369 | |
370 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
371 | /* pkt_setup_dev() expects caller to hold reference to self */ |
372 | if (!try_module_get(THIS_MODULE)) |
373 | return -ENODEV; |
374 | |
375 | pkt_setup_dev(MKDEV(major, minor), NULL); |
376 | |
377 | module_put(THIS_MODULE); |
378 | |
379 | return count; |
380 | } |
381 | |
382 | return -EINVAL; |
383 | } |
384 | |
385 | static ssize_t class_pktcdvd_store_remove(struct class *c, |
386 | struct class_attribute *attr, |
387 | const char *buf, |
388 | size_t count) |
389 | { |
390 | unsigned int major, minor; |
391 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
392 | pkt_remove_dev(MKDEV(major, minor)); |
393 | return count; |
394 | } |
395 | return -EINVAL; |
396 | } |
397 | |
398 | static struct class_attribute class_pktcdvd_attrs[] = { |
399 | __ATTR(add, 0200, NULL, class_pktcdvd_store_add), |
400 | __ATTR(remove, 0200, NULL, class_pktcdvd_store_remove), |
401 | __ATTR(device_map, 0444, class_pktcdvd_show_map, NULL), |
402 | __ATTR_NULL |
403 | }; |
404 | |
405 | |
406 | static int pkt_sysfs_init(void) |
407 | { |
408 | int ret = 0; |
409 | |
410 | /* |
411 | * create control files in sysfs |
412 | * /sys/class/pktcdvd/... |
413 | */ |
414 | class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL); |
415 | if (!class_pktcdvd) |
416 | return -ENOMEM; |
417 | class_pktcdvd->name = DRIVER_NAME; |
418 | class_pktcdvd->owner = THIS_MODULE; |
419 | class_pktcdvd->class_release = class_pktcdvd_release; |
420 | class_pktcdvd->class_attrs = class_pktcdvd_attrs; |
421 | ret = class_register(class_pktcdvd); |
422 | if (ret) { |
423 | kfree(class_pktcdvd); |
424 | class_pktcdvd = NULL; |
425 | printk(DRIVER_NAME": failed to create class pktcdvd\n"); |
426 | return ret; |
427 | } |
428 | return 0; |
429 | } |
430 | |
431 | static void pkt_sysfs_cleanup(void) |
432 | { |
433 | if (class_pktcdvd) |
434 | class_destroy(class_pktcdvd); |
435 | class_pktcdvd = NULL; |
436 | } |
437 | |
438 | /******************************************************************** |
439 | entries in debugfs |
440 | |
441 | /sys/kernel/debug/pktcdvd[0-7]/ |
442 | info |
443 | |
444 | *******************************************************************/ |
445 | |
446 | static int pkt_debugfs_seq_show(struct seq_file *m, void *p) |
447 | { |
448 | return pkt_seq_show(m, p); |
449 | } |
450 | |
451 | static int pkt_debugfs_fops_open(struct inode *inode, struct file *file) |
452 | { |
453 | return single_open(file, pkt_debugfs_seq_show, inode->i_private); |
454 | } |
455 | |
456 | static const struct file_operations debug_fops = { |
457 | .open = pkt_debugfs_fops_open, |
458 | .read = seq_read, |
459 | .llseek = seq_lseek, |
460 | .release = single_release, |
461 | .owner = THIS_MODULE, |
462 | }; |
463 | |
464 | static void pkt_debugfs_dev_new(struct pktcdvd_device *pd) |
465 | { |
466 | if (!pkt_debugfs_root) |
467 | return; |
468 | pd->dfs_f_info = NULL; |
469 | pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root); |
470 | if (IS_ERR(pd->dfs_d_root)) { |
471 | pd->dfs_d_root = NULL; |
472 | return; |
473 | } |
474 | pd->dfs_f_info = debugfs_create_file("info", S_IRUGO, |
475 | pd->dfs_d_root, pd, &debug_fops); |
476 | if (IS_ERR(pd->dfs_f_info)) { |
477 | pd->dfs_f_info = NULL; |
478 | return; |
479 | } |
480 | } |
481 | |
482 | static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd) |
483 | { |
484 | if (!pkt_debugfs_root) |
485 | return; |
486 | if (pd->dfs_f_info) |
487 | debugfs_remove(pd->dfs_f_info); |
488 | pd->dfs_f_info = NULL; |
489 | if (pd->dfs_d_root) |
490 | debugfs_remove(pd->dfs_d_root); |
491 | pd->dfs_d_root = NULL; |
492 | } |
493 | |
494 | static void pkt_debugfs_init(void) |
495 | { |
496 | pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL); |
497 | if (IS_ERR(pkt_debugfs_root)) { |
498 | pkt_debugfs_root = NULL; |
499 | return; |
500 | } |
501 | } |
502 | |
503 | static void pkt_debugfs_cleanup(void) |
504 | { |
505 | if (!pkt_debugfs_root) |
506 | return; |
507 | debugfs_remove(pkt_debugfs_root); |
508 | pkt_debugfs_root = NULL; |
509 | } |
510 | |
511 | /* ----------------------------------------------------------*/ |
512 | |
513 | |
514 | static void pkt_bio_finished(struct pktcdvd_device *pd) |
515 | { |
516 | BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0); |
517 | if (atomic_dec_and_test(&pd->cdrw.pending_bios)) { |
518 | VPRINTK(DRIVER_NAME": queue empty\n"); |
519 | atomic_set(&pd->iosched.attention, 1); |
520 | wake_up(&pd->wqueue); |
521 | } |
522 | } |
523 | |
524 | static void pkt_bio_destructor(struct bio *bio) |
525 | { |
526 | kfree(bio->bi_io_vec); |
527 | kfree(bio); |
528 | } |
529 | |
530 | static struct bio *pkt_bio_alloc(int nr_iovecs) |
531 | { |
532 | struct bio_vec *bvl = NULL; |
533 | struct bio *bio; |
534 | |
535 | bio = kmalloc(sizeof(struct bio), GFP_KERNEL); |
536 | if (!bio) |
537 | goto no_bio; |
538 | bio_init(bio); |
539 | |
540 | bvl = kcalloc(nr_iovecs, sizeof(struct bio_vec), GFP_KERNEL); |
541 | if (!bvl) |
542 | goto no_bvl; |
543 | |
544 | bio->bi_max_vecs = nr_iovecs; |
545 | bio->bi_io_vec = bvl; |
546 | bio->bi_destructor = pkt_bio_destructor; |
547 | |
548 | return bio; |
549 | |
550 | no_bvl: |
551 | kfree(bio); |
552 | no_bio: |
553 | return NULL; |
554 | } |
555 | |
556 | /* |
557 | * Allocate a packet_data struct |
558 | */ |
559 | static struct packet_data *pkt_alloc_packet_data(int frames) |
560 | { |
561 | int i; |
562 | struct packet_data *pkt; |
563 | |
564 | pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL); |
565 | if (!pkt) |
566 | goto no_pkt; |
567 | |
568 | pkt->frames = frames; |
569 | pkt->w_bio = pkt_bio_alloc(frames); |
570 | if (!pkt->w_bio) |
571 | goto no_bio; |
572 | |
573 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) { |
574 | pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO); |
575 | if (!pkt->pages[i]) |
576 | goto no_page; |
577 | } |
578 | |
579 | spin_lock_init(&pkt->lock); |
580 | bio_list_init(&pkt->orig_bios); |
581 | |
582 | for (i = 0; i < frames; i++) { |
583 | struct bio *bio = pkt_bio_alloc(1); |
584 | if (!bio) |
585 | goto no_rd_bio; |
586 | pkt->r_bios[i] = bio; |
587 | } |
588 | |
589 | return pkt; |
590 | |
591 | no_rd_bio: |
592 | for (i = 0; i < frames; i++) { |
593 | struct bio *bio = pkt->r_bios[i]; |
594 | if (bio) |
595 | bio_put(bio); |
596 | } |
597 | |
598 | no_page: |
599 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) |
600 | if (pkt->pages[i]) |
601 | __free_page(pkt->pages[i]); |
602 | bio_put(pkt->w_bio); |
603 | no_bio: |
604 | kfree(pkt); |
605 | no_pkt: |
606 | return NULL; |
607 | } |
608 | |
609 | /* |
610 | * Free a packet_data struct |
611 | */ |
612 | static void pkt_free_packet_data(struct packet_data *pkt) |
613 | { |
614 | int i; |
615 | |
616 | for (i = 0; i < pkt->frames; i++) { |
617 | struct bio *bio = pkt->r_bios[i]; |
618 | if (bio) |
619 | bio_put(bio); |
620 | } |
621 | for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++) |
622 | __free_page(pkt->pages[i]); |
623 | bio_put(pkt->w_bio); |
624 | kfree(pkt); |
625 | } |
626 | |
627 | static void pkt_shrink_pktlist(struct pktcdvd_device *pd) |
628 | { |
629 | struct packet_data *pkt, *next; |
630 | |
631 | BUG_ON(!list_empty(&pd->cdrw.pkt_active_list)); |
632 | |
633 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) { |
634 | pkt_free_packet_data(pkt); |
635 | } |
636 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
637 | } |
638 | |
639 | static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets) |
640 | { |
641 | struct packet_data *pkt; |
642 | |
643 | BUG_ON(!list_empty(&pd->cdrw.pkt_free_list)); |
644 | |
645 | while (nr_packets > 0) { |
646 | pkt = pkt_alloc_packet_data(pd->settings.size >> 2); |
647 | if (!pkt) { |
648 | pkt_shrink_pktlist(pd); |
649 | return 0; |
650 | } |
651 | pkt->id = nr_packets; |
652 | pkt->pd = pd; |
653 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); |
654 | nr_packets--; |
655 | } |
656 | return 1; |
657 | } |
658 | |
659 | static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node) |
660 | { |
661 | struct rb_node *n = rb_next(&node->rb_node); |
662 | if (!n) |
663 | return NULL; |
664 | return rb_entry(n, struct pkt_rb_node, rb_node); |
665 | } |
666 | |
667 | static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node) |
668 | { |
669 | rb_erase(&node->rb_node, &pd->bio_queue); |
670 | mempool_free(node, pd->rb_pool); |
671 | pd->bio_queue_size--; |
672 | BUG_ON(pd->bio_queue_size < 0); |
673 | } |
674 | |
675 | /* |
676 | * Find the first node in the pd->bio_queue rb tree with a starting sector >= s. |
677 | */ |
678 | static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s) |
679 | { |
680 | struct rb_node *n = pd->bio_queue.rb_node; |
681 | struct rb_node *next; |
682 | struct pkt_rb_node *tmp; |
683 | |
684 | if (!n) { |
685 | BUG_ON(pd->bio_queue_size > 0); |
686 | return NULL; |
687 | } |
688 | |
689 | for (;;) { |
690 | tmp = rb_entry(n, struct pkt_rb_node, rb_node); |
691 | if (s <= tmp->bio->bi_sector) |
692 | next = n->rb_left; |
693 | else |
694 | next = n->rb_right; |
695 | if (!next) |
696 | break; |
697 | n = next; |
698 | } |
699 | |
700 | if (s > tmp->bio->bi_sector) { |
701 | tmp = pkt_rbtree_next(tmp); |
702 | if (!tmp) |
703 | return NULL; |
704 | } |
705 | BUG_ON(s > tmp->bio->bi_sector); |
706 | return tmp; |
707 | } |
708 | |
709 | /* |
710 | * Insert a node into the pd->bio_queue rb tree. |
711 | */ |
712 | static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node) |
713 | { |
714 | struct rb_node **p = &pd->bio_queue.rb_node; |
715 | struct rb_node *parent = NULL; |
716 | sector_t s = node->bio->bi_sector; |
717 | struct pkt_rb_node *tmp; |
718 | |
719 | while (*p) { |
720 | parent = *p; |
721 | tmp = rb_entry(parent, struct pkt_rb_node, rb_node); |
722 | if (s < tmp->bio->bi_sector) |
723 | p = &(*p)->rb_left; |
724 | else |
725 | p = &(*p)->rb_right; |
726 | } |
727 | rb_link_node(&node->rb_node, parent, p); |
728 | rb_insert_color(&node->rb_node, &pd->bio_queue); |
729 | pd->bio_queue_size++; |
730 | } |
731 | |
732 | /* |
733 | * Send a packet_command to the underlying block device and |
734 | * wait for completion. |
735 | */ |
736 | static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc) |
737 | { |
738 | struct request_queue *q = bdev_get_queue(pd->bdev); |
739 | struct request *rq; |
740 | int ret = 0; |
741 | |
742 | rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? |
743 | WRITE : READ, __GFP_WAIT); |
744 | |
745 | if (cgc->buflen) { |
746 | if (blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, __GFP_WAIT)) |
747 | goto out; |
748 | } |
749 | |
750 | rq->cmd_len = COMMAND_SIZE(cgc->cmd[0]); |
751 | memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE); |
752 | |
753 | rq->timeout = 60*HZ; |
754 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
755 | rq->cmd_flags |= REQ_HARDBARRIER; |
756 | if (cgc->quiet) |
757 | rq->cmd_flags |= REQ_QUIET; |
758 | |
759 | blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0); |
760 | if (rq->errors) |
761 | ret = -EIO; |
762 | out: |
763 | blk_put_request(rq); |
764 | return ret; |
765 | } |
766 | |
767 | /* |
768 | * A generic sense dump / resolve mechanism should be implemented across |
769 | * all ATAPI + SCSI devices. |
770 | */ |
771 | static void pkt_dump_sense(struct packet_command *cgc) |
772 | { |
773 | static char *info[9] = { "No sense", "Recovered error", "Not ready", |
774 | "Medium error", "Hardware error", "Illegal request", |
775 | "Unit attention", "Data protect", "Blank check" }; |
776 | int i; |
777 | struct request_sense *sense = cgc->sense; |
778 | |
779 | printk(DRIVER_NAME":"); |
780 | for (i = 0; i < CDROM_PACKET_SIZE; i++) |
781 | printk(" %02x", cgc->cmd[i]); |
782 | printk(" - "); |
783 | |
784 | if (sense == NULL) { |
785 | printk("no sense\n"); |
786 | return; |
787 | } |
788 | |
789 | printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq); |
790 | |
791 | if (sense->sense_key > 8) { |
792 | printk(" (INVALID)\n"); |
793 | return; |
794 | } |
795 | |
796 | printk(" (%s)\n", info[sense->sense_key]); |
797 | } |
798 | |
799 | /* |
800 | * flush the drive cache to media |
801 | */ |
802 | static int pkt_flush_cache(struct pktcdvd_device *pd) |
803 | { |
804 | struct packet_command cgc; |
805 | |
806 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); |
807 | cgc.cmd[0] = GPCMD_FLUSH_CACHE; |
808 | cgc.quiet = 1; |
809 | |
810 | /* |
811 | * the IMMED bit -- we default to not setting it, although that |
812 | * would allow a much faster close, this is safer |
813 | */ |
814 | #if 0 |
815 | cgc.cmd[1] = 1 << 1; |
816 | #endif |
817 | return pkt_generic_packet(pd, &cgc); |
818 | } |
819 | |
820 | /* |
821 | * speed is given as the normal factor, e.g. 4 for 4x |
822 | */ |
823 | static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd, |
824 | unsigned write_speed, unsigned read_speed) |
825 | { |
826 | struct packet_command cgc; |
827 | struct request_sense sense; |
828 | int ret; |
829 | |
830 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); |
831 | cgc.sense = &sense; |
832 | cgc.cmd[0] = GPCMD_SET_SPEED; |
833 | cgc.cmd[2] = (read_speed >> 8) & 0xff; |
834 | cgc.cmd[3] = read_speed & 0xff; |
835 | cgc.cmd[4] = (write_speed >> 8) & 0xff; |
836 | cgc.cmd[5] = write_speed & 0xff; |
837 | |
838 | if ((ret = pkt_generic_packet(pd, &cgc))) |
839 | pkt_dump_sense(&cgc); |
840 | |
841 | return ret; |
842 | } |
843 | |
844 | /* |
845 | * Queue a bio for processing by the low-level CD device. Must be called |
846 | * from process context. |
847 | */ |
848 | static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio) |
849 | { |
850 | spin_lock(&pd->iosched.lock); |
851 | if (bio_data_dir(bio) == READ) |
852 | bio_list_add(&pd->iosched.read_queue, bio); |
853 | else |
854 | bio_list_add(&pd->iosched.write_queue, bio); |
855 | spin_unlock(&pd->iosched.lock); |
856 | |
857 | atomic_set(&pd->iosched.attention, 1); |
858 | wake_up(&pd->wqueue); |
859 | } |
860 | |
861 | /* |
862 | * Process the queued read/write requests. This function handles special |
863 | * requirements for CDRW drives: |
864 | * - A cache flush command must be inserted before a read request if the |
865 | * previous request was a write. |
866 | * - Switching between reading and writing is slow, so don't do it more often |
867 | * than necessary. |
868 | * - Optimize for throughput at the expense of latency. This means that streaming |
869 | * writes will never be interrupted by a read, but if the drive has to seek |
870 | * before the next write, switch to reading instead if there are any pending |
871 | * read requests. |
872 | * - Set the read speed according to current usage pattern. When only reading |
873 | * from the device, it's best to use the highest possible read speed, but |
874 | * when switching often between reading and writing, it's better to have the |
875 | * same read and write speeds. |
876 | */ |
877 | static void pkt_iosched_process_queue(struct pktcdvd_device *pd) |
878 | { |
879 | |
880 | if (atomic_read(&pd->iosched.attention) == 0) |
881 | return; |
882 | atomic_set(&pd->iosched.attention, 0); |
883 | |
884 | for (;;) { |
885 | struct bio *bio; |
886 | int reads_queued, writes_queued; |
887 | |
888 | spin_lock(&pd->iosched.lock); |
889 | reads_queued = !bio_list_empty(&pd->iosched.read_queue); |
890 | writes_queued = !bio_list_empty(&pd->iosched.write_queue); |
891 | spin_unlock(&pd->iosched.lock); |
892 | |
893 | if (!reads_queued && !writes_queued) |
894 | break; |
895 | |
896 | if (pd->iosched.writing) { |
897 | int need_write_seek = 1; |
898 | spin_lock(&pd->iosched.lock); |
899 | bio = bio_list_peek(&pd->iosched.write_queue); |
900 | spin_unlock(&pd->iosched.lock); |
901 | if (bio && (bio->bi_sector == pd->iosched.last_write)) |
902 | need_write_seek = 0; |
903 | if (need_write_seek && reads_queued) { |
904 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { |
905 | VPRINTK(DRIVER_NAME": write, waiting\n"); |
906 | break; |
907 | } |
908 | pkt_flush_cache(pd); |
909 | pd->iosched.writing = 0; |
910 | } |
911 | } else { |
912 | if (!reads_queued && writes_queued) { |
913 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { |
914 | VPRINTK(DRIVER_NAME": read, waiting\n"); |
915 | break; |
916 | } |
917 | pd->iosched.writing = 1; |
918 | } |
919 | } |
920 | |
921 | spin_lock(&pd->iosched.lock); |
922 | if (pd->iosched.writing) |
923 | bio = bio_list_pop(&pd->iosched.write_queue); |
924 | else |
925 | bio = bio_list_pop(&pd->iosched.read_queue); |
926 | spin_unlock(&pd->iosched.lock); |
927 | |
928 | if (!bio) |
929 | continue; |
930 | |
931 | if (bio_data_dir(bio) == READ) |
932 | pd->iosched.successive_reads += bio->bi_size >> 10; |
933 | else { |
934 | pd->iosched.successive_reads = 0; |
935 | pd->iosched.last_write = bio->bi_sector + bio_sectors(bio); |
936 | } |
937 | if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) { |
938 | if (pd->read_speed == pd->write_speed) { |
939 | pd->read_speed = MAX_SPEED; |
940 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); |
941 | } |
942 | } else { |
943 | if (pd->read_speed != pd->write_speed) { |
944 | pd->read_speed = pd->write_speed; |
945 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); |
946 | } |
947 | } |
948 | |
949 | atomic_inc(&pd->cdrw.pending_bios); |
950 | generic_make_request(bio); |
951 | } |
952 | } |
953 | |
954 | /* |
955 | * Special care is needed if the underlying block device has a small |
956 | * max_phys_segments value. |
957 | */ |
958 | static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q) |
959 | { |
960 | if ((pd->settings.size << 9) / CD_FRAMESIZE |
961 | <= queue_max_segments(q)) { |
962 | /* |
963 | * The cdrom device can handle one segment/frame |
964 | */ |
965 | clear_bit(PACKET_MERGE_SEGS, &pd->flags); |
966 | return 0; |
967 | } else if ((pd->settings.size << 9) / PAGE_SIZE |
968 | <= queue_max_segments(q)) { |
969 | /* |
970 | * We can handle this case at the expense of some extra memory |
971 | * copies during write operations |
972 | */ |
973 | set_bit(PACKET_MERGE_SEGS, &pd->flags); |
974 | return 0; |
975 | } else { |
976 | printk(DRIVER_NAME": cdrom max_phys_segments too small\n"); |
977 | return -EIO; |
978 | } |
979 | } |
980 | |
981 | /* |
982 | * Copy CD_FRAMESIZE bytes from src_bio into a destination page |
983 | */ |
984 | static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs) |
985 | { |
986 | unsigned int copy_size = CD_FRAMESIZE; |
987 | |
988 | while (copy_size > 0) { |
989 | struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg); |
990 | void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) + |
991 | src_bvl->bv_offset + offs; |
992 | void *vto = page_address(dst_page) + dst_offs; |
993 | int len = min_t(int, copy_size, src_bvl->bv_len - offs); |
994 | |
995 | BUG_ON(len < 0); |
996 | memcpy(vto, vfrom, len); |
997 | kunmap_atomic(vfrom, KM_USER0); |
998 | |
999 | seg++; |
1000 | offs = 0; |
1001 | dst_offs += len; |
1002 | copy_size -= len; |
1003 | } |
1004 | } |
1005 | |
1006 | /* |
1007 | * Copy all data for this packet to pkt->pages[], so that |
1008 | * a) The number of required segments for the write bio is minimized, which |
1009 | * is necessary for some scsi controllers. |
1010 | * b) The data can be used as cache to avoid read requests if we receive a |
1011 | * new write request for the same zone. |
1012 | */ |
1013 | static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec) |
1014 | { |
1015 | int f, p, offs; |
1016 | |
1017 | /* Copy all data to pkt->pages[] */ |
1018 | p = 0; |
1019 | offs = 0; |
1020 | for (f = 0; f < pkt->frames; f++) { |
1021 | if (bvec[f].bv_page != pkt->pages[p]) { |
1022 | void *vfrom = kmap_atomic(bvec[f].bv_page, KM_USER0) + bvec[f].bv_offset; |
1023 | void *vto = page_address(pkt->pages[p]) + offs; |
1024 | memcpy(vto, vfrom, CD_FRAMESIZE); |
1025 | kunmap_atomic(vfrom, KM_USER0); |
1026 | bvec[f].bv_page = pkt->pages[p]; |
1027 | bvec[f].bv_offset = offs; |
1028 | } else { |
1029 | BUG_ON(bvec[f].bv_offset != offs); |
1030 | } |
1031 | offs += CD_FRAMESIZE; |
1032 | if (offs >= PAGE_SIZE) { |
1033 | offs = 0; |
1034 | p++; |
1035 | } |
1036 | } |
1037 | } |
1038 | |
1039 | static void pkt_end_io_read(struct bio *bio, int err) |
1040 | { |
1041 | struct packet_data *pkt = bio->bi_private; |
1042 | struct pktcdvd_device *pd = pkt->pd; |
1043 | BUG_ON(!pd); |
1044 | |
1045 | VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio, |
1046 | (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err); |
1047 | |
1048 | if (err) |
1049 | atomic_inc(&pkt->io_errors); |
1050 | if (atomic_dec_and_test(&pkt->io_wait)) { |
1051 | atomic_inc(&pkt->run_sm); |
1052 | wake_up(&pd->wqueue); |
1053 | } |
1054 | pkt_bio_finished(pd); |
1055 | } |
1056 | |
1057 | static void pkt_end_io_packet_write(struct bio *bio, int err) |
1058 | { |
1059 | struct packet_data *pkt = bio->bi_private; |
1060 | struct pktcdvd_device *pd = pkt->pd; |
1061 | BUG_ON(!pd); |
1062 | |
1063 | VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err); |
1064 | |
1065 | pd->stats.pkt_ended++; |
1066 | |
1067 | pkt_bio_finished(pd); |
1068 | atomic_dec(&pkt->io_wait); |
1069 | atomic_inc(&pkt->run_sm); |
1070 | wake_up(&pd->wqueue); |
1071 | } |
1072 | |
1073 | /* |
1074 | * Schedule reads for the holes in a packet |
1075 | */ |
1076 | static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) |
1077 | { |
1078 | int frames_read = 0; |
1079 | struct bio *bio; |
1080 | int f; |
1081 | char written[PACKET_MAX_SIZE]; |
1082 | |
1083 | BUG_ON(bio_list_empty(&pkt->orig_bios)); |
1084 | |
1085 | atomic_set(&pkt->io_wait, 0); |
1086 | atomic_set(&pkt->io_errors, 0); |
1087 | |
1088 | /* |
1089 | * Figure out which frames we need to read before we can write. |
1090 | */ |
1091 | memset(written, 0, sizeof(written)); |
1092 | spin_lock(&pkt->lock); |
1093 | bio_list_for_each(bio, &pkt->orig_bios) { |
1094 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); |
1095 | int num_frames = bio->bi_size / CD_FRAMESIZE; |
1096 | pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9); |
1097 | BUG_ON(first_frame < 0); |
1098 | BUG_ON(first_frame + num_frames > pkt->frames); |
1099 | for (f = first_frame; f < first_frame + num_frames; f++) |
1100 | written[f] = 1; |
1101 | } |
1102 | spin_unlock(&pkt->lock); |
1103 | |
1104 | if (pkt->cache_valid) { |
1105 | VPRINTK("pkt_gather_data: zone %llx cached\n", |
1106 | (unsigned long long)pkt->sector); |
1107 | goto out_account; |
1108 | } |
1109 | |
1110 | /* |
1111 | * Schedule reads for missing parts of the packet. |
1112 | */ |
1113 | for (f = 0; f < pkt->frames; f++) { |
1114 | struct bio_vec *vec; |
1115 | |
1116 | int p, offset; |
1117 | if (written[f]) |
1118 | continue; |
1119 | bio = pkt->r_bios[f]; |
1120 | vec = bio->bi_io_vec; |
1121 | bio_init(bio); |
1122 | bio->bi_max_vecs = 1; |
1123 | bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); |
1124 | bio->bi_bdev = pd->bdev; |
1125 | bio->bi_end_io = pkt_end_io_read; |
1126 | bio->bi_private = pkt; |
1127 | bio->bi_io_vec = vec; |
1128 | bio->bi_destructor = pkt_bio_destructor; |
1129 | |
1130 | p = (f * CD_FRAMESIZE) / PAGE_SIZE; |
1131 | offset = (f * CD_FRAMESIZE) % PAGE_SIZE; |
1132 | VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n", |
1133 | f, pkt->pages[p], offset); |
1134 | if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset)) |
1135 | BUG(); |
1136 | |
1137 | atomic_inc(&pkt->io_wait); |
1138 | bio->bi_rw = READ; |
1139 | pkt_queue_bio(pd, bio); |
1140 | frames_read++; |
1141 | } |
1142 | |
1143 | out_account: |
1144 | VPRINTK("pkt_gather_data: need %d frames for zone %llx\n", |
1145 | frames_read, (unsigned long long)pkt->sector); |
1146 | pd->stats.pkt_started++; |
1147 | pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9); |
1148 | } |
1149 | |
1150 | /* |
1151 | * Find a packet matching zone, or the least recently used packet if |
1152 | * there is no match. |
1153 | */ |
1154 | static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone) |
1155 | { |
1156 | struct packet_data *pkt; |
1157 | |
1158 | list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) { |
1159 | if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) { |
1160 | list_del_init(&pkt->list); |
1161 | if (pkt->sector != zone) |
1162 | pkt->cache_valid = 0; |
1163 | return pkt; |
1164 | } |
1165 | } |
1166 | BUG(); |
1167 | return NULL; |
1168 | } |
1169 | |
1170 | static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt) |
1171 | { |
1172 | if (pkt->cache_valid) { |
1173 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); |
1174 | } else { |
1175 | list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list); |
1176 | } |
1177 | } |
1178 | |
1179 | /* |
1180 | * recover a failed write, query for relocation if possible |
1181 | * |
1182 | * returns 1 if recovery is possible, or 0 if not |
1183 | * |
1184 | */ |
1185 | static int pkt_start_recovery(struct packet_data *pkt) |
1186 | { |
1187 | /* |
1188 | * FIXME. We need help from the file system to implement |
1189 | * recovery handling. |
1190 | */ |
1191 | return 0; |
1192 | #if 0 |
1193 | struct request *rq = pkt->rq; |
1194 | struct pktcdvd_device *pd = rq->rq_disk->private_data; |
1195 | struct block_device *pkt_bdev; |
1196 | struct super_block *sb = NULL; |
1197 | unsigned long old_block, new_block; |
1198 | sector_t new_sector; |
1199 | |
1200 | pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev)); |
1201 | if (pkt_bdev) { |
1202 | sb = get_super(pkt_bdev); |
1203 | bdput(pkt_bdev); |
1204 | } |
1205 | |
1206 | if (!sb) |
1207 | return 0; |
1208 | |
1209 | if (!sb->s_op || !sb->s_op->relocate_blocks) |
1210 | goto out; |
1211 | |
1212 | old_block = pkt->sector / (CD_FRAMESIZE >> 9); |
1213 | if (sb->s_op->relocate_blocks(sb, old_block, &new_block)) |
1214 | goto out; |
1215 | |
1216 | new_sector = new_block * (CD_FRAMESIZE >> 9); |
1217 | pkt->sector = new_sector; |
1218 | |
1219 | pkt->bio->bi_sector = new_sector; |
1220 | pkt->bio->bi_next = NULL; |
1221 | pkt->bio->bi_flags = 1 << BIO_UPTODATE; |
1222 | pkt->bio->bi_idx = 0; |
1223 | |
1224 | BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW)); |
1225 | BUG_ON(pkt->bio->bi_vcnt != pkt->frames); |
1226 | BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE); |
1227 | BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write); |
1228 | BUG_ON(pkt->bio->bi_private != pkt); |
1229 | |
1230 | drop_super(sb); |
1231 | return 1; |
1232 | |
1233 | out: |
1234 | drop_super(sb); |
1235 | return 0; |
1236 | #endif |
1237 | } |
1238 | |
1239 | static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state) |
1240 | { |
1241 | #if PACKET_DEBUG > 1 |
1242 | static const char *state_name[] = { |
1243 | "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED" |
1244 | }; |
1245 | enum packet_data_state old_state = pkt->state; |
1246 | VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector, |
1247 | state_name[old_state], state_name[state]); |
1248 | #endif |
1249 | pkt->state = state; |
1250 | } |
1251 | |
1252 | /* |
1253 | * Scan the work queue to see if we can start a new packet. |
1254 | * returns non-zero if any work was done. |
1255 | */ |
1256 | static int pkt_handle_queue(struct pktcdvd_device *pd) |
1257 | { |
1258 | struct packet_data *pkt, *p; |
1259 | struct bio *bio = NULL; |
1260 | sector_t zone = 0; /* Suppress gcc warning */ |
1261 | struct pkt_rb_node *node, *first_node; |
1262 | struct rb_node *n; |
1263 | int wakeup; |
1264 | |
1265 | VPRINTK("handle_queue\n"); |
1266 | |
1267 | atomic_set(&pd->scan_queue, 0); |
1268 | |
1269 | if (list_empty(&pd->cdrw.pkt_free_list)) { |
1270 | VPRINTK("handle_queue: no pkt\n"); |
1271 | return 0; |
1272 | } |
1273 | |
1274 | /* |
1275 | * Try to find a zone we are not already working on. |
1276 | */ |
1277 | spin_lock(&pd->lock); |
1278 | first_node = pkt_rbtree_find(pd, pd->current_sector); |
1279 | if (!first_node) { |
1280 | n = rb_first(&pd->bio_queue); |
1281 | if (n) |
1282 | first_node = rb_entry(n, struct pkt_rb_node, rb_node); |
1283 | } |
1284 | node = first_node; |
1285 | while (node) { |
1286 | bio = node->bio; |
1287 | zone = ZONE(bio->bi_sector, pd); |
1288 | list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) { |
1289 | if (p->sector == zone) { |
1290 | bio = NULL; |
1291 | goto try_next_bio; |
1292 | } |
1293 | } |
1294 | break; |
1295 | try_next_bio: |
1296 | node = pkt_rbtree_next(node); |
1297 | if (!node) { |
1298 | n = rb_first(&pd->bio_queue); |
1299 | if (n) |
1300 | node = rb_entry(n, struct pkt_rb_node, rb_node); |
1301 | } |
1302 | if (node == first_node) |
1303 | node = NULL; |
1304 | } |
1305 | spin_unlock(&pd->lock); |
1306 | if (!bio) { |
1307 | VPRINTK("handle_queue: no bio\n"); |
1308 | return 0; |
1309 | } |
1310 | |
1311 | pkt = pkt_get_packet_data(pd, zone); |
1312 | |
1313 | pd->current_sector = zone + pd->settings.size; |
1314 | pkt->sector = zone; |
1315 | BUG_ON(pkt->frames != pd->settings.size >> 2); |
1316 | pkt->write_size = 0; |
1317 | |
1318 | /* |
1319 | * Scan work queue for bios in the same zone and link them |
1320 | * to this packet. |
1321 | */ |
1322 | spin_lock(&pd->lock); |
1323 | VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone); |
1324 | while ((node = pkt_rbtree_find(pd, zone)) != NULL) { |
1325 | bio = node->bio; |
1326 | VPRINTK("pkt_handle_queue: found zone=%llx\n", |
1327 | (unsigned long long)ZONE(bio->bi_sector, pd)); |
1328 | if (ZONE(bio->bi_sector, pd) != zone) |
1329 | break; |
1330 | pkt_rbtree_erase(pd, node); |
1331 | spin_lock(&pkt->lock); |
1332 | bio_list_add(&pkt->orig_bios, bio); |
1333 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; |
1334 | spin_unlock(&pkt->lock); |
1335 | } |
1336 | /* check write congestion marks, and if bio_queue_size is |
1337 | below, wake up any waiters */ |
1338 | wakeup = (pd->write_congestion_on > 0 |
1339 | && pd->bio_queue_size <= pd->write_congestion_off); |
1340 | spin_unlock(&pd->lock); |
1341 | if (wakeup) { |
1342 | clear_bdi_congested(&pd->disk->queue->backing_dev_info, |
1343 | BLK_RW_ASYNC); |
1344 | } |
1345 | |
1346 | pkt->sleep_time = max(PACKET_WAIT_TIME, 1); |
1347 | pkt_set_state(pkt, PACKET_WAITING_STATE); |
1348 | atomic_set(&pkt->run_sm, 1); |
1349 | |
1350 | spin_lock(&pd->cdrw.active_list_lock); |
1351 | list_add(&pkt->list, &pd->cdrw.pkt_active_list); |
1352 | spin_unlock(&pd->cdrw.active_list_lock); |
1353 | |
1354 | return 1; |
1355 | } |
1356 | |
1357 | /* |
1358 | * Assemble a bio to write one packet and queue the bio for processing |
1359 | * by the underlying block device. |
1360 | */ |
1361 | static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) |
1362 | { |
1363 | struct bio *bio; |
1364 | int f; |
1365 | int frames_write; |
1366 | struct bio_vec *bvec = pkt->w_bio->bi_io_vec; |
1367 | |
1368 | for (f = 0; f < pkt->frames; f++) { |
1369 | bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; |
1370 | bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE; |
1371 | } |
1372 | |
1373 | /* |
1374 | * Fill-in bvec with data from orig_bios. |
1375 | */ |
1376 | frames_write = 0; |
1377 | spin_lock(&pkt->lock); |
1378 | bio_list_for_each(bio, &pkt->orig_bios) { |
1379 | int segment = bio->bi_idx; |
1380 | int src_offs = 0; |
1381 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); |
1382 | int num_frames = bio->bi_size / CD_FRAMESIZE; |
1383 | BUG_ON(first_frame < 0); |
1384 | BUG_ON(first_frame + num_frames > pkt->frames); |
1385 | for (f = first_frame; f < first_frame + num_frames; f++) { |
1386 | struct bio_vec *src_bvl = bio_iovec_idx(bio, segment); |
1387 | |
1388 | while (src_offs >= src_bvl->bv_len) { |
1389 | src_offs -= src_bvl->bv_len; |
1390 | segment++; |
1391 | BUG_ON(segment >= bio->bi_vcnt); |
1392 | src_bvl = bio_iovec_idx(bio, segment); |
1393 | } |
1394 | |
1395 | if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) { |
1396 | bvec[f].bv_page = src_bvl->bv_page; |
1397 | bvec[f].bv_offset = src_bvl->bv_offset + src_offs; |
1398 | } else { |
1399 | pkt_copy_bio_data(bio, segment, src_offs, |
1400 | bvec[f].bv_page, bvec[f].bv_offset); |
1401 | } |
1402 | src_offs += CD_FRAMESIZE; |
1403 | frames_write++; |
1404 | } |
1405 | } |
1406 | pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE); |
1407 | spin_unlock(&pkt->lock); |
1408 | |
1409 | VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n", |
1410 | frames_write, (unsigned long long)pkt->sector); |
1411 | BUG_ON(frames_write != pkt->write_size); |
1412 | |
1413 | if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) { |
1414 | pkt_make_local_copy(pkt, bvec); |
1415 | pkt->cache_valid = 1; |
1416 | } else { |
1417 | pkt->cache_valid = 0; |
1418 | } |
1419 | |
1420 | /* Start the write request */ |
1421 | bio_init(pkt->w_bio); |
1422 | pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE; |
1423 | pkt->w_bio->bi_sector = pkt->sector; |
1424 | pkt->w_bio->bi_bdev = pd->bdev; |
1425 | pkt->w_bio->bi_end_io = pkt_end_io_packet_write; |
1426 | pkt->w_bio->bi_private = pkt; |
1427 | pkt->w_bio->bi_io_vec = bvec; |
1428 | pkt->w_bio->bi_destructor = pkt_bio_destructor; |
1429 | for (f = 0; f < pkt->frames; f++) |
1430 | if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset)) |
1431 | BUG(); |
1432 | VPRINTK(DRIVER_NAME": vcnt=%d\n", pkt->w_bio->bi_vcnt); |
1433 | |
1434 | atomic_set(&pkt->io_wait, 1); |
1435 | pkt->w_bio->bi_rw = WRITE; |
1436 | pkt_queue_bio(pd, pkt->w_bio); |
1437 | } |
1438 | |
1439 | static void pkt_finish_packet(struct packet_data *pkt, int uptodate) |
1440 | { |
1441 | struct bio *bio; |
1442 | |
1443 | if (!uptodate) |
1444 | pkt->cache_valid = 0; |
1445 | |
1446 | /* Finish all bios corresponding to this packet */ |
1447 | while ((bio = bio_list_pop(&pkt->orig_bios))) |
1448 | bio_endio(bio, uptodate ? 0 : -EIO); |
1449 | } |
1450 | |
1451 | static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt) |
1452 | { |
1453 | int uptodate; |
1454 | |
1455 | VPRINTK("run_state_machine: pkt %d\n", pkt->id); |
1456 | |
1457 | for (;;) { |
1458 | switch (pkt->state) { |
1459 | case PACKET_WAITING_STATE: |
1460 | if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0)) |
1461 | return; |
1462 | |
1463 | pkt->sleep_time = 0; |
1464 | pkt_gather_data(pd, pkt); |
1465 | pkt_set_state(pkt, PACKET_READ_WAIT_STATE); |
1466 | break; |
1467 | |
1468 | case PACKET_READ_WAIT_STATE: |
1469 | if (atomic_read(&pkt->io_wait) > 0) |
1470 | return; |
1471 | |
1472 | if (atomic_read(&pkt->io_errors) > 0) { |
1473 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); |
1474 | } else { |
1475 | pkt_start_write(pd, pkt); |
1476 | } |
1477 | break; |
1478 | |
1479 | case PACKET_WRITE_WAIT_STATE: |
1480 | if (atomic_read(&pkt->io_wait) > 0) |
1481 | return; |
1482 | |
1483 | if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) { |
1484 | pkt_set_state(pkt, PACKET_FINISHED_STATE); |
1485 | } else { |
1486 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); |
1487 | } |
1488 | break; |
1489 | |
1490 | case PACKET_RECOVERY_STATE: |
1491 | if (pkt_start_recovery(pkt)) { |
1492 | pkt_start_write(pd, pkt); |
1493 | } else { |
1494 | VPRINTK("No recovery possible\n"); |
1495 | pkt_set_state(pkt, PACKET_FINISHED_STATE); |
1496 | } |
1497 | break; |
1498 | |
1499 | case PACKET_FINISHED_STATE: |
1500 | uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags); |
1501 | pkt_finish_packet(pkt, uptodate); |
1502 | return; |
1503 | |
1504 | default: |
1505 | BUG(); |
1506 | break; |
1507 | } |
1508 | } |
1509 | } |
1510 | |
1511 | static void pkt_handle_packets(struct pktcdvd_device *pd) |
1512 | { |
1513 | struct packet_data *pkt, *next; |
1514 | |
1515 | VPRINTK("pkt_handle_packets\n"); |
1516 | |
1517 | /* |
1518 | * Run state machine for active packets |
1519 | */ |
1520 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
1521 | if (atomic_read(&pkt->run_sm) > 0) { |
1522 | atomic_set(&pkt->run_sm, 0); |
1523 | pkt_run_state_machine(pd, pkt); |
1524 | } |
1525 | } |
1526 | |
1527 | /* |
1528 | * Move no longer active packets to the free list |
1529 | */ |
1530 | spin_lock(&pd->cdrw.active_list_lock); |
1531 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) { |
1532 | if (pkt->state == PACKET_FINISHED_STATE) { |
1533 | list_del(&pkt->list); |
1534 | pkt_put_packet_data(pd, pkt); |
1535 | pkt_set_state(pkt, PACKET_IDLE_STATE); |
1536 | atomic_set(&pd->scan_queue, 1); |
1537 | } |
1538 | } |
1539 | spin_unlock(&pd->cdrw.active_list_lock); |
1540 | } |
1541 | |
1542 | static void pkt_count_states(struct pktcdvd_device *pd, int *states) |
1543 | { |
1544 | struct packet_data *pkt; |
1545 | int i; |
1546 | |
1547 | for (i = 0; i < PACKET_NUM_STATES; i++) |
1548 | states[i] = 0; |
1549 | |
1550 | spin_lock(&pd->cdrw.active_list_lock); |
1551 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
1552 | states[pkt->state]++; |
1553 | } |
1554 | spin_unlock(&pd->cdrw.active_list_lock); |
1555 | } |
1556 | |
1557 | /* |
1558 | * kcdrwd is woken up when writes have been queued for one of our |
1559 | * registered devices |
1560 | */ |
1561 | static int kcdrwd(void *foobar) |
1562 | { |
1563 | struct pktcdvd_device *pd = foobar; |
1564 | struct packet_data *pkt; |
1565 | long min_sleep_time, residue; |
1566 | |
1567 | set_user_nice(current, -20); |
1568 | set_freezable(); |
1569 | |
1570 | for (;;) { |
1571 | DECLARE_WAITQUEUE(wait, current); |
1572 | |
1573 | /* |
1574 | * Wait until there is something to do |
1575 | */ |
1576 | add_wait_queue(&pd->wqueue, &wait); |
1577 | for (;;) { |
1578 | set_current_state(TASK_INTERRUPTIBLE); |
1579 | |
1580 | /* Check if we need to run pkt_handle_queue */ |
1581 | if (atomic_read(&pd->scan_queue) > 0) |
1582 | goto work_to_do; |
1583 | |
1584 | /* Check if we need to run the state machine for some packet */ |
1585 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
1586 | if (atomic_read(&pkt->run_sm) > 0) |
1587 | goto work_to_do; |
1588 | } |
1589 | |
1590 | /* Check if we need to process the iosched queues */ |
1591 | if (atomic_read(&pd->iosched.attention) != 0) |
1592 | goto work_to_do; |
1593 | |
1594 | /* Otherwise, go to sleep */ |
1595 | if (PACKET_DEBUG > 1) { |
1596 | int states[PACKET_NUM_STATES]; |
1597 | pkt_count_states(pd, states); |
1598 | VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", |
1599 | states[0], states[1], states[2], states[3], |
1600 | states[4], states[5]); |
1601 | } |
1602 | |
1603 | min_sleep_time = MAX_SCHEDULE_TIMEOUT; |
1604 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
1605 | if (pkt->sleep_time && pkt->sleep_time < min_sleep_time) |
1606 | min_sleep_time = pkt->sleep_time; |
1607 | } |
1608 | |
1609 | generic_unplug_device(bdev_get_queue(pd->bdev)); |
1610 | |
1611 | VPRINTK("kcdrwd: sleeping\n"); |
1612 | residue = schedule_timeout(min_sleep_time); |
1613 | VPRINTK("kcdrwd: wake up\n"); |
1614 | |
1615 | /* make swsusp happy with our thread */ |
1616 | try_to_freeze(); |
1617 | |
1618 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
1619 | if (!pkt->sleep_time) |
1620 | continue; |
1621 | pkt->sleep_time -= min_sleep_time - residue; |
1622 | if (pkt->sleep_time <= 0) { |
1623 | pkt->sleep_time = 0; |
1624 | atomic_inc(&pkt->run_sm); |
1625 | } |
1626 | } |
1627 | |
1628 | if (kthread_should_stop()) |
1629 | break; |
1630 | } |
1631 | work_to_do: |
1632 | set_current_state(TASK_RUNNING); |
1633 | remove_wait_queue(&pd->wqueue, &wait); |
1634 | |
1635 | if (kthread_should_stop()) |
1636 | break; |
1637 | |
1638 | /* |
1639 | * if pkt_handle_queue returns true, we can queue |
1640 | * another request. |
1641 | */ |
1642 | while (pkt_handle_queue(pd)) |
1643 | ; |
1644 | |
1645 | /* |
1646 | * Handle packet state machine |
1647 | */ |
1648 | pkt_handle_packets(pd); |
1649 | |
1650 | /* |
1651 | * Handle iosched queues |
1652 | */ |
1653 | pkt_iosched_process_queue(pd); |
1654 | } |
1655 | |
1656 | return 0; |
1657 | } |
1658 | |
1659 | static void pkt_print_settings(struct pktcdvd_device *pd) |
1660 | { |
1661 | printk(DRIVER_NAME": %s packets, ", pd->settings.fp ? "Fixed" : "Variable"); |
1662 | printk("%u blocks, ", pd->settings.size >> 2); |
1663 | printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2'); |
1664 | } |
1665 | |
1666 | static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control) |
1667 | { |
1668 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); |
1669 | |
1670 | cgc->cmd[0] = GPCMD_MODE_SENSE_10; |
1671 | cgc->cmd[2] = page_code | (page_control << 6); |
1672 | cgc->cmd[7] = cgc->buflen >> 8; |
1673 | cgc->cmd[8] = cgc->buflen & 0xff; |
1674 | cgc->data_direction = CGC_DATA_READ; |
1675 | return pkt_generic_packet(pd, cgc); |
1676 | } |
1677 | |
1678 | static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc) |
1679 | { |
1680 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); |
1681 | memset(cgc->buffer, 0, 2); |
1682 | cgc->cmd[0] = GPCMD_MODE_SELECT_10; |
1683 | cgc->cmd[1] = 0x10; /* PF */ |
1684 | cgc->cmd[7] = cgc->buflen >> 8; |
1685 | cgc->cmd[8] = cgc->buflen & 0xff; |
1686 | cgc->data_direction = CGC_DATA_WRITE; |
1687 | return pkt_generic_packet(pd, cgc); |
1688 | } |
1689 | |
1690 | static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di) |
1691 | { |
1692 | struct packet_command cgc; |
1693 | int ret; |
1694 | |
1695 | /* set up command and get the disc info */ |
1696 | init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ); |
1697 | cgc.cmd[0] = GPCMD_READ_DISC_INFO; |
1698 | cgc.cmd[8] = cgc.buflen = 2; |
1699 | cgc.quiet = 1; |
1700 | |
1701 | if ((ret = pkt_generic_packet(pd, &cgc))) |
1702 | return ret; |
1703 | |
1704 | /* not all drives have the same disc_info length, so requeue |
1705 | * packet with the length the drive tells us it can supply |
1706 | */ |
1707 | cgc.buflen = be16_to_cpu(di->disc_information_length) + |
1708 | sizeof(di->disc_information_length); |
1709 | |
1710 | if (cgc.buflen > sizeof(disc_information)) |
1711 | cgc.buflen = sizeof(disc_information); |
1712 | |
1713 | cgc.cmd[8] = cgc.buflen; |
1714 | return pkt_generic_packet(pd, &cgc); |
1715 | } |
1716 | |
1717 | static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti) |
1718 | { |
1719 | struct packet_command cgc; |
1720 | int ret; |
1721 | |
1722 | init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ); |
1723 | cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO; |
1724 | cgc.cmd[1] = type & 3; |
1725 | cgc.cmd[4] = (track & 0xff00) >> 8; |
1726 | cgc.cmd[5] = track & 0xff; |
1727 | cgc.cmd[8] = 8; |
1728 | cgc.quiet = 1; |
1729 | |
1730 | if ((ret = pkt_generic_packet(pd, &cgc))) |
1731 | return ret; |
1732 | |
1733 | cgc.buflen = be16_to_cpu(ti->track_information_length) + |
1734 | sizeof(ti->track_information_length); |
1735 | |
1736 | if (cgc.buflen > sizeof(track_information)) |
1737 | cgc.buflen = sizeof(track_information); |
1738 | |
1739 | cgc.cmd[8] = cgc.buflen; |
1740 | return pkt_generic_packet(pd, &cgc); |
1741 | } |
1742 | |
1743 | static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd, |
1744 | long *last_written) |
1745 | { |
1746 | disc_information di; |
1747 | track_information ti; |
1748 | __u32 last_track; |
1749 | int ret = -1; |
1750 | |
1751 | if ((ret = pkt_get_disc_info(pd, &di))) |
1752 | return ret; |
1753 | |
1754 | last_track = (di.last_track_msb << 8) | di.last_track_lsb; |
1755 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) |
1756 | return ret; |
1757 | |
1758 | /* if this track is blank, try the previous. */ |
1759 | if (ti.blank) { |
1760 | last_track--; |
1761 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) |
1762 | return ret; |
1763 | } |
1764 | |
1765 | /* if last recorded field is valid, return it. */ |
1766 | if (ti.lra_v) { |
1767 | *last_written = be32_to_cpu(ti.last_rec_address); |
1768 | } else { |
1769 | /* make it up instead */ |
1770 | *last_written = be32_to_cpu(ti.track_start) + |
1771 | be32_to_cpu(ti.track_size); |
1772 | if (ti.free_blocks) |
1773 | *last_written -= (be32_to_cpu(ti.free_blocks) + 7); |
1774 | } |
1775 | return 0; |
1776 | } |
1777 | |
1778 | /* |
1779 | * write mode select package based on pd->settings |
1780 | */ |
1781 | static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd) |
1782 | { |
1783 | struct packet_command cgc; |
1784 | struct request_sense sense; |
1785 | write_param_page *wp; |
1786 | char buffer[128]; |
1787 | int ret, size; |
1788 | |
1789 | /* doesn't apply to DVD+RW or DVD-RAM */ |
1790 | if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12)) |
1791 | return 0; |
1792 | |
1793 | memset(buffer, 0, sizeof(buffer)); |
1794 | init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ); |
1795 | cgc.sense = &sense; |
1796 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { |
1797 | pkt_dump_sense(&cgc); |
1798 | return ret; |
1799 | } |
1800 | |
1801 | size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff)); |
1802 | pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff); |
1803 | if (size > sizeof(buffer)) |
1804 | size = sizeof(buffer); |
1805 | |
1806 | /* |
1807 | * now get it all |
1808 | */ |
1809 | init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ); |
1810 | cgc.sense = &sense; |
1811 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { |
1812 | pkt_dump_sense(&cgc); |
1813 | return ret; |
1814 | } |
1815 | |
1816 | /* |
1817 | * write page is offset header + block descriptor length |
1818 | */ |
1819 | wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset]; |
1820 | |
1821 | wp->fp = pd->settings.fp; |
1822 | wp->track_mode = pd->settings.track_mode; |
1823 | wp->write_type = pd->settings.write_type; |
1824 | wp->data_block_type = pd->settings.block_mode; |
1825 | |
1826 | wp->multi_session = 0; |
1827 | |
1828 | #ifdef PACKET_USE_LS |
1829 | wp->link_size = 7; |
1830 | wp->ls_v = 1; |
1831 | #endif |
1832 | |
1833 | if (wp->data_block_type == PACKET_BLOCK_MODE1) { |
1834 | wp->session_format = 0; |
1835 | wp->subhdr2 = 0x20; |
1836 | } else if (wp->data_block_type == PACKET_BLOCK_MODE2) { |
1837 | wp->session_format = 0x20; |
1838 | wp->subhdr2 = 8; |
1839 | #if 0 |
1840 | wp->mcn[0] = 0x80; |
1841 | memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1); |
1842 | #endif |
1843 | } else { |
1844 | /* |
1845 | * paranoia |
1846 | */ |
1847 | printk(DRIVER_NAME": write mode wrong %d\n", wp->data_block_type); |
1848 | return 1; |
1849 | } |
1850 | wp->packet_size = cpu_to_be32(pd->settings.size >> 2); |
1851 | |
1852 | cgc.buflen = cgc.cmd[8] = size; |
1853 | if ((ret = pkt_mode_select(pd, &cgc))) { |
1854 | pkt_dump_sense(&cgc); |
1855 | return ret; |
1856 | } |
1857 | |
1858 | pkt_print_settings(pd); |
1859 | return 0; |
1860 | } |
1861 | |
1862 | /* |
1863 | * 1 -- we can write to this track, 0 -- we can't |
1864 | */ |
1865 | static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti) |
1866 | { |
1867 | switch (pd->mmc3_profile) { |
1868 | case 0x1a: /* DVD+RW */ |
1869 | case 0x12: /* DVD-RAM */ |
1870 | /* The track is always writable on DVD+RW/DVD-RAM */ |
1871 | return 1; |
1872 | default: |
1873 | break; |
1874 | } |
1875 | |
1876 | if (!ti->packet || !ti->fp) |
1877 | return 0; |
1878 | |
1879 | /* |
1880 | * "good" settings as per Mt Fuji. |
1881 | */ |
1882 | if (ti->rt == 0 && ti->blank == 0) |
1883 | return 1; |
1884 | |
1885 | if (ti->rt == 0 && ti->blank == 1) |
1886 | return 1; |
1887 | |
1888 | if (ti->rt == 1 && ti->blank == 0) |
1889 | return 1; |
1890 | |
1891 | printk(DRIVER_NAME": bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet); |
1892 | return 0; |
1893 | } |
1894 | |
1895 | /* |
1896 | * 1 -- we can write to this disc, 0 -- we can't |
1897 | */ |
1898 | static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di) |
1899 | { |
1900 | switch (pd->mmc3_profile) { |
1901 | case 0x0a: /* CD-RW */ |
1902 | case 0xffff: /* MMC3 not supported */ |
1903 | break; |
1904 | case 0x1a: /* DVD+RW */ |
1905 | case 0x13: /* DVD-RW */ |
1906 | case 0x12: /* DVD-RAM */ |
1907 | return 1; |
1908 | default: |
1909 | VPRINTK(DRIVER_NAME": Wrong disc profile (%x)\n", pd->mmc3_profile); |
1910 | return 0; |
1911 | } |
1912 | |
1913 | /* |
1914 | * for disc type 0xff we should probably reserve a new track. |
1915 | * but i'm not sure, should we leave this to user apps? probably. |
1916 | */ |
1917 | if (di->disc_type == 0xff) { |
1918 | printk(DRIVER_NAME": Unknown disc. No track?\n"); |
1919 | return 0; |
1920 | } |
1921 | |
1922 | if (di->disc_type != 0x20 && di->disc_type != 0) { |
1923 | printk(DRIVER_NAME": Wrong disc type (%x)\n", di->disc_type); |
1924 | return 0; |
1925 | } |
1926 | |
1927 | if (di->erasable == 0) { |
1928 | printk(DRIVER_NAME": Disc not erasable\n"); |
1929 | return 0; |
1930 | } |
1931 | |
1932 | if (di->border_status == PACKET_SESSION_RESERVED) { |
1933 | printk(DRIVER_NAME": Can't write to last track (reserved)\n"); |
1934 | return 0; |
1935 | } |
1936 | |
1937 | return 1; |
1938 | } |
1939 | |
1940 | static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd) |
1941 | { |
1942 | struct packet_command cgc; |
1943 | unsigned char buf[12]; |
1944 | disc_information di; |
1945 | track_information ti; |
1946 | int ret, track; |
1947 | |
1948 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); |
1949 | cgc.cmd[0] = GPCMD_GET_CONFIGURATION; |
1950 | cgc.cmd[8] = 8; |
1951 | ret = pkt_generic_packet(pd, &cgc); |
1952 | pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7]; |
1953 | |
1954 | memset(&di, 0, sizeof(disc_information)); |
1955 | memset(&ti, 0, sizeof(track_information)); |
1956 | |
1957 | if ((ret = pkt_get_disc_info(pd, &di))) { |
1958 | printk("failed get_disc\n"); |
1959 | return ret; |
1960 | } |
1961 | |
1962 | if (!pkt_writable_disc(pd, &di)) |
1963 | return -EROFS; |
1964 | |
1965 | pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR; |
1966 | |
1967 | track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */ |
1968 | if ((ret = pkt_get_track_info(pd, track, 1, &ti))) { |
1969 | printk(DRIVER_NAME": failed get_track\n"); |
1970 | return ret; |
1971 | } |
1972 | |
1973 | if (!pkt_writable_track(pd, &ti)) { |
1974 | printk(DRIVER_NAME": can't write to this track\n"); |
1975 | return -EROFS; |
1976 | } |
1977 | |
1978 | /* |
1979 | * we keep packet size in 512 byte units, makes it easier to |
1980 | * deal with request calculations. |
1981 | */ |
1982 | pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2; |
1983 | if (pd->settings.size == 0) { |
1984 | printk(DRIVER_NAME": detected zero packet size!\n"); |
1985 | return -ENXIO; |
1986 | } |
1987 | if (pd->settings.size > PACKET_MAX_SECTORS) { |
1988 | printk(DRIVER_NAME": packet size is too big\n"); |
1989 | return -EROFS; |
1990 | } |
1991 | pd->settings.fp = ti.fp; |
1992 | pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1); |
1993 | |
1994 | if (ti.nwa_v) { |
1995 | pd->nwa = be32_to_cpu(ti.next_writable); |
1996 | set_bit(PACKET_NWA_VALID, &pd->flags); |
1997 | } |
1998 | |
1999 | /* |
2000 | * in theory we could use lra on -RW media as well and just zero |
2001 | * blocks that haven't been written yet, but in practice that |
2002 | * is just a no-go. we'll use that for -R, naturally. |
2003 | */ |
2004 | if (ti.lra_v) { |
2005 | pd->lra = be32_to_cpu(ti.last_rec_address); |
2006 | set_bit(PACKET_LRA_VALID, &pd->flags); |
2007 | } else { |
2008 | pd->lra = 0xffffffff; |
2009 | set_bit(PACKET_LRA_VALID, &pd->flags); |
2010 | } |
2011 | |
2012 | /* |
2013 | * fine for now |
2014 | */ |
2015 | pd->settings.link_loss = 7; |
2016 | pd->settings.write_type = 0; /* packet */ |
2017 | pd->settings.track_mode = ti.track_mode; |
2018 | |
2019 | /* |
2020 | * mode1 or mode2 disc |
2021 | */ |
2022 | switch (ti.data_mode) { |
2023 | case PACKET_MODE1: |
2024 | pd->settings.block_mode = PACKET_BLOCK_MODE1; |
2025 | break; |
2026 | case PACKET_MODE2: |
2027 | pd->settings.block_mode = PACKET_BLOCK_MODE2; |
2028 | break; |
2029 | default: |
2030 | printk(DRIVER_NAME": unknown data mode\n"); |
2031 | return -EROFS; |
2032 | } |
2033 | return 0; |
2034 | } |
2035 | |
2036 | /* |
2037 | * enable/disable write caching on drive |
2038 | */ |
2039 | static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd, |
2040 | int set) |
2041 | { |
2042 | struct packet_command cgc; |
2043 | struct request_sense sense; |
2044 | unsigned char buf[64]; |
2045 | int ret; |
2046 | |
2047 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); |
2048 | cgc.sense = &sense; |
2049 | cgc.buflen = pd->mode_offset + 12; |
2050 | |
2051 | /* |
2052 | * caching mode page might not be there, so quiet this command |
2053 | */ |
2054 | cgc.quiet = 1; |
2055 | |
2056 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0))) |
2057 | return ret; |
2058 | |
2059 | buf[pd->mode_offset + 10] |= (!!set << 2); |
2060 | |
2061 | cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff)); |
2062 | ret = pkt_mode_select(pd, &cgc); |
2063 | if (ret) { |
2064 | printk(DRIVER_NAME": write caching control failed\n"); |
2065 | pkt_dump_sense(&cgc); |
2066 | } else if (!ret && set) |
2067 | printk(DRIVER_NAME": enabled write caching on %s\n", pd->name); |
2068 | return ret; |
2069 | } |
2070 | |
2071 | static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag) |
2072 | { |
2073 | struct packet_command cgc; |
2074 | |
2075 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); |
2076 | cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL; |
2077 | cgc.cmd[4] = lockflag ? 1 : 0; |
2078 | return pkt_generic_packet(pd, &cgc); |
2079 | } |
2080 | |
2081 | /* |
2082 | * Returns drive maximum write speed |
2083 | */ |
2084 | static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd, |
2085 | unsigned *write_speed) |
2086 | { |
2087 | struct packet_command cgc; |
2088 | struct request_sense sense; |
2089 | unsigned char buf[256+18]; |
2090 | unsigned char *cap_buf; |
2091 | int ret, offset; |
2092 | |
2093 | cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset]; |
2094 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN); |
2095 | cgc.sense = &sense; |
2096 | |
2097 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); |
2098 | if (ret) { |
2099 | cgc.buflen = pd->mode_offset + cap_buf[1] + 2 + |
2100 | sizeof(struct mode_page_header); |
2101 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); |
2102 | if (ret) { |
2103 | pkt_dump_sense(&cgc); |
2104 | return ret; |
2105 | } |
2106 | } |
2107 | |
2108 | offset = 20; /* Obsoleted field, used by older drives */ |
2109 | if (cap_buf[1] >= 28) |
2110 | offset = 28; /* Current write speed selected */ |
2111 | if (cap_buf[1] >= 30) { |
2112 | /* If the drive reports at least one "Logical Unit Write |
2113 | * Speed Performance Descriptor Block", use the information |
2114 | * in the first block. (contains the highest speed) |
2115 | */ |
2116 | int num_spdb = (cap_buf[30] << 8) + cap_buf[31]; |
2117 | if (num_spdb > 0) |
2118 | offset = 34; |
2119 | } |
2120 | |
2121 | *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1]; |
2122 | return 0; |
2123 | } |
2124 | |
2125 | /* These tables from cdrecord - I don't have orange book */ |
2126 | /* standard speed CD-RW (1-4x) */ |
2127 | static char clv_to_speed[16] = { |
2128 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ |
2129 | 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
2130 | }; |
2131 | /* high speed CD-RW (-10x) */ |
2132 | static char hs_clv_to_speed[16] = { |
2133 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ |
2134 | 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
2135 | }; |
2136 | /* ultra high speed CD-RW */ |
2137 | static char us_clv_to_speed[16] = { |
2138 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ |
2139 | 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0 |
2140 | }; |
2141 | |
2142 | /* |
2143 | * reads the maximum media speed from ATIP |
2144 | */ |
2145 | static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd, |
2146 | unsigned *speed) |
2147 | { |
2148 | struct packet_command cgc; |
2149 | struct request_sense sense; |
2150 | unsigned char buf[64]; |
2151 | unsigned int size, st, sp; |
2152 | int ret; |
2153 | |
2154 | init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ); |
2155 | cgc.sense = &sense; |
2156 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; |
2157 | cgc.cmd[1] = 2; |
2158 | cgc.cmd[2] = 4; /* READ ATIP */ |
2159 | cgc.cmd[8] = 2; |
2160 | ret = pkt_generic_packet(pd, &cgc); |
2161 | if (ret) { |
2162 | pkt_dump_sense(&cgc); |
2163 | return ret; |
2164 | } |
2165 | size = ((unsigned int) buf[0]<<8) + buf[1] + 2; |
2166 | if (size > sizeof(buf)) |
2167 | size = sizeof(buf); |
2168 | |
2169 | init_cdrom_command(&cgc, buf, size, CGC_DATA_READ); |
2170 | cgc.sense = &sense; |
2171 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; |
2172 | cgc.cmd[1] = 2; |
2173 | cgc.cmd[2] = 4; |
2174 | cgc.cmd[8] = size; |
2175 | ret = pkt_generic_packet(pd, &cgc); |
2176 | if (ret) { |
2177 | pkt_dump_sense(&cgc); |
2178 | return ret; |
2179 | } |
2180 | |
2181 | if (!(buf[6] & 0x40)) { |
2182 | printk(DRIVER_NAME": Disc type is not CD-RW\n"); |
2183 | return 1; |
2184 | } |
2185 | if (!(buf[6] & 0x4)) { |
2186 | printk(DRIVER_NAME": A1 values on media are not valid, maybe not CDRW?\n"); |
2187 | return 1; |
2188 | } |
2189 | |
2190 | st = (buf[6] >> 3) & 0x7; /* disc sub-type */ |
2191 | |
2192 | sp = buf[16] & 0xf; /* max speed from ATIP A1 field */ |
2193 | |
2194 | /* Info from cdrecord */ |
2195 | switch (st) { |
2196 | case 0: /* standard speed */ |
2197 | *speed = clv_to_speed[sp]; |
2198 | break; |
2199 | case 1: /* high speed */ |
2200 | *speed = hs_clv_to_speed[sp]; |
2201 | break; |
2202 | case 2: /* ultra high speed */ |
2203 | *speed = us_clv_to_speed[sp]; |
2204 | break; |
2205 | default: |
2206 | printk(DRIVER_NAME": Unknown disc sub-type %d\n",st); |
2207 | return 1; |
2208 | } |
2209 | if (*speed) { |
2210 | printk(DRIVER_NAME": Max. media speed: %d\n",*speed); |
2211 | return 0; |
2212 | } else { |
2213 | printk(DRIVER_NAME": Unknown speed %d for sub-type %d\n",sp,st); |
2214 | return 1; |
2215 | } |
2216 | } |
2217 | |
2218 | static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd) |
2219 | { |
2220 | struct packet_command cgc; |
2221 | struct request_sense sense; |
2222 | int ret; |
2223 | |
2224 | VPRINTK(DRIVER_NAME": Performing OPC\n"); |
2225 | |
2226 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); |
2227 | cgc.sense = &sense; |
2228 | cgc.timeout = 60*HZ; |
2229 | cgc.cmd[0] = GPCMD_SEND_OPC; |
2230 | cgc.cmd[1] = 1; |
2231 | if ((ret = pkt_generic_packet(pd, &cgc))) |
2232 | pkt_dump_sense(&cgc); |
2233 | return ret; |
2234 | } |
2235 | |
2236 | static int pkt_open_write(struct pktcdvd_device *pd) |
2237 | { |
2238 | int ret; |
2239 | unsigned int write_speed, media_write_speed, read_speed; |
2240 | |
2241 | if ((ret = pkt_probe_settings(pd))) { |
2242 | VPRINTK(DRIVER_NAME": %s failed probe\n", pd->name); |
2243 | return ret; |
2244 | } |
2245 | |
2246 | if ((ret = pkt_set_write_settings(pd))) { |
2247 | DPRINTK(DRIVER_NAME": %s failed saving write settings\n", pd->name); |
2248 | return -EIO; |
2249 | } |
2250 | |
2251 | pkt_write_caching(pd, USE_WCACHING); |
2252 | |
2253 | if ((ret = pkt_get_max_speed(pd, &write_speed))) |
2254 | write_speed = 16 * 177; |
2255 | switch (pd->mmc3_profile) { |
2256 | case 0x13: /* DVD-RW */ |
2257 | case 0x1a: /* DVD+RW */ |
2258 | case 0x12: /* DVD-RAM */ |
2259 | DPRINTK(DRIVER_NAME": write speed %ukB/s\n", write_speed); |
2260 | break; |
2261 | default: |
2262 | if ((ret = pkt_media_speed(pd, &media_write_speed))) |
2263 | media_write_speed = 16; |
2264 | write_speed = min(write_speed, media_write_speed * 177); |
2265 | DPRINTK(DRIVER_NAME": write speed %ux\n", write_speed / 176); |
2266 | break; |
2267 | } |
2268 | read_speed = write_speed; |
2269 | |
2270 | if ((ret = pkt_set_speed(pd, write_speed, read_speed))) { |
2271 | DPRINTK(DRIVER_NAME": %s couldn't set write speed\n", pd->name); |
2272 | return -EIO; |
2273 | } |
2274 | pd->write_speed = write_speed; |
2275 | pd->read_speed = read_speed; |
2276 | |
2277 | if ((ret = pkt_perform_opc(pd))) { |
2278 | DPRINTK(DRIVER_NAME": %s Optimum Power Calibration failed\n", pd->name); |
2279 | } |
2280 | |
2281 | return 0; |
2282 | } |
2283 | |
2284 | /* |
2285 | * called at open time. |
2286 | */ |
2287 | static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write) |
2288 | { |
2289 | int ret; |
2290 | long lba; |
2291 | struct request_queue *q; |
2292 | |
2293 | /* |
2294 | * We need to re-open the cdrom device without O_NONBLOCK to be able |
2295 | * to read/write from/to it. It is already opened in O_NONBLOCK mode |
2296 | * so bdget() can't fail. |
2297 | */ |
2298 | bdget(pd->bdev->bd_dev); |
2299 | if ((ret = blkdev_get(pd->bdev, FMODE_READ))) |
2300 | goto out; |
2301 | |
2302 | if ((ret = bd_claim(pd->bdev, pd))) |
2303 | goto out_putdev; |
2304 | |
2305 | if ((ret = pkt_get_last_written(pd, &lba))) { |
2306 | printk(DRIVER_NAME": pkt_get_last_written failed\n"); |
2307 | goto out_unclaim; |
2308 | } |
2309 | |
2310 | set_capacity(pd->disk, lba << 2); |
2311 | set_capacity(pd->bdev->bd_disk, lba << 2); |
2312 | bd_set_size(pd->bdev, (loff_t)lba << 11); |
2313 | |
2314 | q = bdev_get_queue(pd->bdev); |
2315 | if (write) { |
2316 | if ((ret = pkt_open_write(pd))) |
2317 | goto out_unclaim; |
2318 | /* |
2319 | * Some CDRW drives can not handle writes larger than one packet, |
2320 | * even if the size is a multiple of the packet size. |
2321 | */ |
2322 | spin_lock_irq(q->queue_lock); |
2323 | blk_queue_max_hw_sectors(q, pd->settings.size); |
2324 | spin_unlock_irq(q->queue_lock); |
2325 | set_bit(PACKET_WRITABLE, &pd->flags); |
2326 | } else { |
2327 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); |
2328 | clear_bit(PACKET_WRITABLE, &pd->flags); |
2329 | } |
2330 | |
2331 | if ((ret = pkt_set_segment_merging(pd, q))) |
2332 | goto out_unclaim; |
2333 | |
2334 | if (write) { |
2335 | if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { |
2336 | printk(DRIVER_NAME": not enough memory for buffers\n"); |
2337 | ret = -ENOMEM; |
2338 | goto out_unclaim; |
2339 | } |
2340 | printk(DRIVER_NAME": %lukB available on disc\n", lba << 1); |
2341 | } |
2342 | |
2343 | return 0; |
2344 | |
2345 | out_unclaim: |
2346 | bd_release(pd->bdev); |
2347 | out_putdev: |
2348 | blkdev_put(pd->bdev, FMODE_READ); |
2349 | out: |
2350 | return ret; |
2351 | } |
2352 | |
2353 | /* |
2354 | * called when the device is closed. makes sure that the device flushes |
2355 | * the internal cache before we close. |
2356 | */ |
2357 | static void pkt_release_dev(struct pktcdvd_device *pd, int flush) |
2358 | { |
2359 | if (flush && pkt_flush_cache(pd)) |
2360 | DPRINTK(DRIVER_NAME": %s not flushing cache\n", pd->name); |
2361 | |
2362 | pkt_lock_door(pd, 0); |
2363 | |
2364 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); |
2365 | bd_release(pd->bdev); |
2366 | blkdev_put(pd->bdev, FMODE_READ); |
2367 | |
2368 | pkt_shrink_pktlist(pd); |
2369 | } |
2370 | |
2371 | static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor) |
2372 | { |
2373 | if (dev_minor >= MAX_WRITERS) |
2374 | return NULL; |
2375 | return pkt_devs[dev_minor]; |
2376 | } |
2377 | |
2378 | static int pkt_open(struct block_device *bdev, fmode_t mode) |
2379 | { |
2380 | struct pktcdvd_device *pd = NULL; |
2381 | int ret; |
2382 | |
2383 | VPRINTK(DRIVER_NAME": entering open\n"); |
2384 | |
2385 | mutex_lock(&ctl_mutex); |
2386 | pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev)); |
2387 | if (!pd) { |
2388 | ret = -ENODEV; |
2389 | goto out; |
2390 | } |
2391 | BUG_ON(pd->refcnt < 0); |
2392 | |
2393 | pd->refcnt++; |
2394 | if (pd->refcnt > 1) { |
2395 | if ((mode & FMODE_WRITE) && |
2396 | !test_bit(PACKET_WRITABLE, &pd->flags)) { |
2397 | ret = -EBUSY; |
2398 | goto out_dec; |
2399 | } |
2400 | } else { |
2401 | ret = pkt_open_dev(pd, mode & FMODE_WRITE); |
2402 | if (ret) |
2403 | goto out_dec; |
2404 | /* |
2405 | * needed here as well, since ext2 (among others) may change |
2406 | * the blocksize at mount time |
2407 | */ |
2408 | set_blocksize(bdev, CD_FRAMESIZE); |
2409 | } |
2410 | |
2411 | mutex_unlock(&ctl_mutex); |
2412 | return 0; |
2413 | |
2414 | out_dec: |
2415 | pd->refcnt--; |
2416 | out: |
2417 | VPRINTK(DRIVER_NAME": failed open (%d)\n", ret); |
2418 | mutex_unlock(&ctl_mutex); |
2419 | return ret; |
2420 | } |
2421 | |
2422 | static int pkt_close(struct gendisk *disk, fmode_t mode) |
2423 | { |
2424 | struct pktcdvd_device *pd = disk->private_data; |
2425 | int ret = 0; |
2426 | |
2427 | mutex_lock(&ctl_mutex); |
2428 | pd->refcnt--; |
2429 | BUG_ON(pd->refcnt < 0); |
2430 | if (pd->refcnt == 0) { |
2431 | int flush = test_bit(PACKET_WRITABLE, &pd->flags); |
2432 | pkt_release_dev(pd, flush); |
2433 | } |
2434 | mutex_unlock(&ctl_mutex); |
2435 | return ret; |
2436 | } |
2437 | |
2438 | |
2439 | static void pkt_end_io_read_cloned(struct bio *bio, int err) |
2440 | { |
2441 | struct packet_stacked_data *psd = bio->bi_private; |
2442 | struct pktcdvd_device *pd = psd->pd; |
2443 | |
2444 | bio_put(bio); |
2445 | bio_endio(psd->bio, err); |
2446 | mempool_free(psd, psd_pool); |
2447 | pkt_bio_finished(pd); |
2448 | } |
2449 | |
2450 | static int pkt_make_request(struct request_queue *q, struct bio *bio) |
2451 | { |
2452 | struct pktcdvd_device *pd; |
2453 | char b[BDEVNAME_SIZE]; |
2454 | sector_t zone; |
2455 | struct packet_data *pkt; |
2456 | int was_empty, blocked_bio; |
2457 | struct pkt_rb_node *node; |
2458 | |
2459 | pd = q->queuedata; |
2460 | if (!pd) { |
2461 | printk(DRIVER_NAME": %s incorrect request queue\n", bdevname(bio->bi_bdev, b)); |
2462 | goto end_io; |
2463 | } |
2464 | |
2465 | /* |
2466 | * Clone READ bios so we can have our own bi_end_io callback. |
2467 | */ |
2468 | if (bio_data_dir(bio) == READ) { |
2469 | struct bio *cloned_bio = bio_clone(bio, GFP_NOIO); |
2470 | struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO); |
2471 | |
2472 | psd->pd = pd; |
2473 | psd->bio = bio; |
2474 | cloned_bio->bi_bdev = pd->bdev; |
2475 | cloned_bio->bi_private = psd; |
2476 | cloned_bio->bi_end_io = pkt_end_io_read_cloned; |
2477 | pd->stats.secs_r += bio->bi_size >> 9; |
2478 | pkt_queue_bio(pd, cloned_bio); |
2479 | return 0; |
2480 | } |
2481 | |
2482 | if (!test_bit(PACKET_WRITABLE, &pd->flags)) { |
2483 | printk(DRIVER_NAME": WRITE for ro device %s (%llu)\n", |
2484 | pd->name, (unsigned long long)bio->bi_sector); |
2485 | goto end_io; |
2486 | } |
2487 | |
2488 | if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) { |
2489 | printk(DRIVER_NAME": wrong bio size\n"); |
2490 | goto end_io; |
2491 | } |
2492 | |
2493 | blk_queue_bounce(q, &bio); |
2494 | |
2495 | zone = ZONE(bio->bi_sector, pd); |
2496 | VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n", |
2497 | (unsigned long long)bio->bi_sector, |
2498 | (unsigned long long)(bio->bi_sector + bio_sectors(bio))); |
2499 | |
2500 | /* Check if we have to split the bio */ |
2501 | { |
2502 | struct bio_pair *bp; |
2503 | sector_t last_zone; |
2504 | int first_sectors; |
2505 | |
2506 | last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd); |
2507 | if (last_zone != zone) { |
2508 | BUG_ON(last_zone != zone + pd->settings.size); |
2509 | first_sectors = last_zone - bio->bi_sector; |
2510 | bp = bio_split(bio, first_sectors); |
2511 | BUG_ON(!bp); |
2512 | pkt_make_request(q, &bp->bio1); |
2513 | pkt_make_request(q, &bp->bio2); |
2514 | bio_pair_release(bp); |
2515 | return 0; |
2516 | } |
2517 | } |
2518 | |
2519 | /* |
2520 | * If we find a matching packet in state WAITING or READ_WAIT, we can |
2521 | * just append this bio to that packet. |
2522 | */ |
2523 | spin_lock(&pd->cdrw.active_list_lock); |
2524 | blocked_bio = 0; |
2525 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
2526 | if (pkt->sector == zone) { |
2527 | spin_lock(&pkt->lock); |
2528 | if ((pkt->state == PACKET_WAITING_STATE) || |
2529 | (pkt->state == PACKET_READ_WAIT_STATE)) { |
2530 | bio_list_add(&pkt->orig_bios, bio); |
2531 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; |
2532 | if ((pkt->write_size >= pkt->frames) && |
2533 | (pkt->state == PACKET_WAITING_STATE)) { |
2534 | atomic_inc(&pkt->run_sm); |
2535 | wake_up(&pd->wqueue); |
2536 | } |
2537 | spin_unlock(&pkt->lock); |
2538 | spin_unlock(&pd->cdrw.active_list_lock); |
2539 | return 0; |
2540 | } else { |
2541 | blocked_bio = 1; |
2542 | } |
2543 | spin_unlock(&pkt->lock); |
2544 | } |
2545 | } |
2546 | spin_unlock(&pd->cdrw.active_list_lock); |
2547 | |
2548 | /* |
2549 | * Test if there is enough room left in the bio work queue |
2550 | * (queue size >= congestion on mark). |
2551 | * If not, wait till the work queue size is below the congestion off mark. |
2552 | */ |
2553 | spin_lock(&pd->lock); |
2554 | if (pd->write_congestion_on > 0 |
2555 | && pd->bio_queue_size >= pd->write_congestion_on) { |
2556 | set_bdi_congested(&q->backing_dev_info, BLK_RW_ASYNC); |
2557 | do { |
2558 | spin_unlock(&pd->lock); |
2559 | congestion_wait(BLK_RW_ASYNC, HZ); |
2560 | spin_lock(&pd->lock); |
2561 | } while(pd->bio_queue_size > pd->write_congestion_off); |
2562 | } |
2563 | spin_unlock(&pd->lock); |
2564 | |
2565 | /* |
2566 | * No matching packet found. Store the bio in the work queue. |
2567 | */ |
2568 | node = mempool_alloc(pd->rb_pool, GFP_NOIO); |
2569 | node->bio = bio; |
2570 | spin_lock(&pd->lock); |
2571 | BUG_ON(pd->bio_queue_size < 0); |
2572 | was_empty = (pd->bio_queue_size == 0); |
2573 | pkt_rbtree_insert(pd, node); |
2574 | spin_unlock(&pd->lock); |
2575 | |
2576 | /* |
2577 | * Wake up the worker thread. |
2578 | */ |
2579 | atomic_set(&pd->scan_queue, 1); |
2580 | if (was_empty) { |
2581 | /* This wake_up is required for correct operation */ |
2582 | wake_up(&pd->wqueue); |
2583 | } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) { |
2584 | /* |
2585 | * This wake up is not required for correct operation, |
2586 | * but improves performance in some cases. |
2587 | */ |
2588 | wake_up(&pd->wqueue); |
2589 | } |
2590 | return 0; |
2591 | end_io: |
2592 | bio_io_error(bio); |
2593 | return 0; |
2594 | } |
2595 | |
2596 | |
2597 | |
2598 | static int pkt_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, |
2599 | struct bio_vec *bvec) |
2600 | { |
2601 | struct pktcdvd_device *pd = q->queuedata; |
2602 | sector_t zone = ZONE(bmd->bi_sector, pd); |
2603 | int used = ((bmd->bi_sector - zone) << 9) + bmd->bi_size; |
2604 | int remaining = (pd->settings.size << 9) - used; |
2605 | int remaining2; |
2606 | |
2607 | /* |
2608 | * A bio <= PAGE_SIZE must be allowed. If it crosses a packet |
2609 | * boundary, pkt_make_request() will split the bio. |
2610 | */ |
2611 | remaining2 = PAGE_SIZE - bmd->bi_size; |
2612 | remaining = max(remaining, remaining2); |
2613 | |
2614 | BUG_ON(remaining < 0); |
2615 | return remaining; |
2616 | } |
2617 | |
2618 | static void pkt_init_queue(struct pktcdvd_device *pd) |
2619 | { |
2620 | struct request_queue *q = pd->disk->queue; |
2621 | |
2622 | blk_queue_make_request(q, pkt_make_request); |
2623 | blk_queue_logical_block_size(q, CD_FRAMESIZE); |
2624 | blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS); |
2625 | blk_queue_merge_bvec(q, pkt_merge_bvec); |
2626 | q->queuedata = pd; |
2627 | } |
2628 | |
2629 | static int pkt_seq_show(struct seq_file *m, void *p) |
2630 | { |
2631 | struct pktcdvd_device *pd = m->private; |
2632 | char *msg; |
2633 | char bdev_buf[BDEVNAME_SIZE]; |
2634 | int states[PACKET_NUM_STATES]; |
2635 | |
2636 | seq_printf(m, "Writer %s mapped to %s:\n", pd->name, |
2637 | bdevname(pd->bdev, bdev_buf)); |
2638 | |
2639 | seq_printf(m, "\nSettings:\n"); |
2640 | seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2); |
2641 | |
2642 | if (pd->settings.write_type == 0) |
2643 | msg = "Packet"; |
2644 | else |
2645 | msg = "Unknown"; |
2646 | seq_printf(m, "\twrite type:\t\t%s\n", msg); |
2647 | |
2648 | seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable"); |
2649 | seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss); |
2650 | |
2651 | seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode); |
2652 | |
2653 | if (pd->settings.block_mode == PACKET_BLOCK_MODE1) |
2654 | msg = "Mode 1"; |
2655 | else if (pd->settings.block_mode == PACKET_BLOCK_MODE2) |
2656 | msg = "Mode 2"; |
2657 | else |
2658 | msg = "Unknown"; |
2659 | seq_printf(m, "\tblock mode:\t\t%s\n", msg); |
2660 | |
2661 | seq_printf(m, "\nStatistics:\n"); |
2662 | seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started); |
2663 | seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended); |
2664 | seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1); |
2665 | seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1); |
2666 | seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1); |
2667 | |
2668 | seq_printf(m, "\nMisc:\n"); |
2669 | seq_printf(m, "\treference count:\t%d\n", pd->refcnt); |
2670 | seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags); |
2671 | seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed); |
2672 | seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed); |
2673 | seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset); |
2674 | seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset); |
2675 | |
2676 | seq_printf(m, "\nQueue state:\n"); |
2677 | seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size); |
2678 | seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios)); |
2679 | seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector); |
2680 | |
2681 | pkt_count_states(pd, states); |
2682 | seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", |
2683 | states[0], states[1], states[2], states[3], states[4], states[5]); |
2684 | |
2685 | seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n", |
2686 | pd->write_congestion_off, |
2687 | pd->write_congestion_on); |
2688 | return 0; |
2689 | } |
2690 | |
2691 | static int pkt_seq_open(struct inode *inode, struct file *file) |
2692 | { |
2693 | return single_open(file, pkt_seq_show, PDE(inode)->data); |
2694 | } |
2695 | |
2696 | static const struct file_operations pkt_proc_fops = { |
2697 | .open = pkt_seq_open, |
2698 | .read = seq_read, |
2699 | .llseek = seq_lseek, |
2700 | .release = single_release |
2701 | }; |
2702 | |
2703 | static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) |
2704 | { |
2705 | int i; |
2706 | int ret = 0; |
2707 | char b[BDEVNAME_SIZE]; |
2708 | struct block_device *bdev; |
2709 | |
2710 | if (pd->pkt_dev == dev) { |
2711 | printk(DRIVER_NAME": Recursive setup not allowed\n"); |
2712 | return -EBUSY; |
2713 | } |
2714 | for (i = 0; i < MAX_WRITERS; i++) { |
2715 | struct pktcdvd_device *pd2 = pkt_devs[i]; |
2716 | if (!pd2) |
2717 | continue; |
2718 | if (pd2->bdev->bd_dev == dev) { |
2719 | printk(DRIVER_NAME": %s already setup\n", bdevname(pd2->bdev, b)); |
2720 | return -EBUSY; |
2721 | } |
2722 | if (pd2->pkt_dev == dev) { |
2723 | printk(DRIVER_NAME": Can't chain pktcdvd devices\n"); |
2724 | return -EBUSY; |
2725 | } |
2726 | } |
2727 | |
2728 | bdev = bdget(dev); |
2729 | if (!bdev) |
2730 | return -ENOMEM; |
2731 | ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY); |
2732 | if (ret) |
2733 | return ret; |
2734 | |
2735 | /* This is safe, since we have a reference from open(). */ |
2736 | __module_get(THIS_MODULE); |
2737 | |
2738 | pd->bdev = bdev; |
2739 | set_blocksize(bdev, CD_FRAMESIZE); |
2740 | |
2741 | pkt_init_queue(pd); |
2742 | |
2743 | atomic_set(&pd->cdrw.pending_bios, 0); |
2744 | pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name); |
2745 | if (IS_ERR(pd->cdrw.thread)) { |
2746 | printk(DRIVER_NAME": can't start kernel thread\n"); |
2747 | ret = -ENOMEM; |
2748 | goto out_mem; |
2749 | } |
2750 | |
2751 | proc_create_data(pd->name, 0, pkt_proc, &pkt_proc_fops, pd); |
2752 | DPRINTK(DRIVER_NAME": writer %s mapped to %s\n", pd->name, bdevname(bdev, b)); |
2753 | return 0; |
2754 | |
2755 | out_mem: |
2756 | blkdev_put(bdev, FMODE_READ | FMODE_NDELAY); |
2757 | /* This is safe: open() is still holding a reference. */ |
2758 | module_put(THIS_MODULE); |
2759 | return ret; |
2760 | } |
2761 | |
2762 | static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) |
2763 | { |
2764 | struct pktcdvd_device *pd = bdev->bd_disk->private_data; |
2765 | |
2766 | VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, |
2767 | MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev)); |
2768 | |
2769 | switch (cmd) { |
2770 | case CDROMEJECT: |
2771 | /* |
2772 | * The door gets locked when the device is opened, so we |
2773 | * have to unlock it or else the eject command fails. |
2774 | */ |
2775 | if (pd->refcnt == 1) |
2776 | pkt_lock_door(pd, 0); |
2777 | /* fallthru */ |
2778 | /* |
2779 | * forward selected CDROM ioctls to CD-ROM, for UDF |
2780 | */ |
2781 | case CDROMMULTISESSION: |
2782 | case CDROMREADTOCENTRY: |
2783 | case CDROM_LAST_WRITTEN: |
2784 | case CDROM_SEND_PACKET: |
2785 | case SCSI_IOCTL_SEND_COMMAND: |
2786 | return __blkdev_driver_ioctl(pd->bdev, mode, cmd, arg); |
2787 | |
2788 | default: |
2789 | VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd); |
2790 | return -ENOTTY; |
2791 | } |
2792 | |
2793 | return 0; |
2794 | } |
2795 | |
2796 | static int pkt_media_changed(struct gendisk *disk) |
2797 | { |
2798 | struct pktcdvd_device *pd = disk->private_data; |
2799 | struct gendisk *attached_disk; |
2800 | |
2801 | if (!pd) |
2802 | return 0; |
2803 | if (!pd->bdev) |
2804 | return 0; |
2805 | attached_disk = pd->bdev->bd_disk; |
2806 | if (!attached_disk) |
2807 | return 0; |
2808 | return attached_disk->fops->media_changed(attached_disk); |
2809 | } |
2810 | |
2811 | static const struct block_device_operations pktcdvd_ops = { |
2812 | .owner = THIS_MODULE, |
2813 | .open = pkt_open, |
2814 | .release = pkt_close, |
2815 | .locked_ioctl = pkt_ioctl, |
2816 | .media_changed = pkt_media_changed, |
2817 | }; |
2818 | |
2819 | static char *pktcdvd_devnode(struct gendisk *gd, mode_t *mode) |
2820 | { |
2821 | return kasprintf(GFP_KERNEL, "pktcdvd/%s", gd->disk_name); |
2822 | } |
2823 | |
2824 | /* |
2825 | * Set up mapping from pktcdvd device to CD-ROM device. |
2826 | */ |
2827 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) |
2828 | { |
2829 | int idx; |
2830 | int ret = -ENOMEM; |
2831 | struct pktcdvd_device *pd; |
2832 | struct gendisk *disk; |
2833 | |
2834 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
2835 | |
2836 | for (idx = 0; idx < MAX_WRITERS; idx++) |
2837 | if (!pkt_devs[idx]) |
2838 | break; |
2839 | if (idx == MAX_WRITERS) { |
2840 | printk(DRIVER_NAME": max %d writers supported\n", MAX_WRITERS); |
2841 | ret = -EBUSY; |
2842 | goto out_mutex; |
2843 | } |
2844 | |
2845 | pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL); |
2846 | if (!pd) |
2847 | goto out_mutex; |
2848 | |
2849 | pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE, |
2850 | sizeof(struct pkt_rb_node)); |
2851 | if (!pd->rb_pool) |
2852 | goto out_mem; |
2853 | |
2854 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
2855 | INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); |
2856 | spin_lock_init(&pd->cdrw.active_list_lock); |
2857 | |
2858 | spin_lock_init(&pd->lock); |
2859 | spin_lock_init(&pd->iosched.lock); |
2860 | bio_list_init(&pd->iosched.read_queue); |
2861 | bio_list_init(&pd->iosched.write_queue); |
2862 | sprintf(pd->name, DRIVER_NAME"%d", idx); |
2863 | init_waitqueue_head(&pd->wqueue); |
2864 | pd->bio_queue = RB_ROOT; |
2865 | |
2866 | pd->write_congestion_on = write_congestion_on; |
2867 | pd->write_congestion_off = write_congestion_off; |
2868 | |
2869 | disk = alloc_disk(1); |
2870 | if (!disk) |
2871 | goto out_mem; |
2872 | pd->disk = disk; |
2873 | disk->major = pktdev_major; |
2874 | disk->first_minor = idx; |
2875 | disk->fops = &pktcdvd_ops; |
2876 | disk->flags = GENHD_FL_REMOVABLE; |
2877 | strcpy(disk->disk_name, pd->name); |
2878 | disk->devnode = pktcdvd_devnode; |
2879 | disk->private_data = pd; |
2880 | disk->queue = blk_alloc_queue(GFP_KERNEL); |
2881 | if (!disk->queue) |
2882 | goto out_mem2; |
2883 | |
2884 | pd->pkt_dev = MKDEV(pktdev_major, idx); |
2885 | ret = pkt_new_dev(pd, dev); |
2886 | if (ret) |
2887 | goto out_new_dev; |
2888 | |
2889 | add_disk(disk); |
2890 | |
2891 | pkt_sysfs_dev_new(pd); |
2892 | pkt_debugfs_dev_new(pd); |
2893 | |
2894 | pkt_devs[idx] = pd; |
2895 | if (pkt_dev) |
2896 | *pkt_dev = pd->pkt_dev; |
2897 | |
2898 | mutex_unlock(&ctl_mutex); |
2899 | return 0; |
2900 | |
2901 | out_new_dev: |
2902 | blk_cleanup_queue(disk->queue); |
2903 | out_mem2: |
2904 | put_disk(disk); |
2905 | out_mem: |
2906 | if (pd->rb_pool) |
2907 | mempool_destroy(pd->rb_pool); |
2908 | kfree(pd); |
2909 | out_mutex: |
2910 | mutex_unlock(&ctl_mutex); |
2911 | printk(DRIVER_NAME": setup of pktcdvd device failed\n"); |
2912 | return ret; |
2913 | } |
2914 | |
2915 | /* |
2916 | * Tear down mapping from pktcdvd device to CD-ROM device. |
2917 | */ |
2918 | static int pkt_remove_dev(dev_t pkt_dev) |
2919 | { |
2920 | struct pktcdvd_device *pd; |
2921 | int idx; |
2922 | int ret = 0; |
2923 | |
2924 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
2925 | |
2926 | for (idx = 0; idx < MAX_WRITERS; idx++) { |
2927 | pd = pkt_devs[idx]; |
2928 | if (pd && (pd->pkt_dev == pkt_dev)) |
2929 | break; |
2930 | } |
2931 | if (idx == MAX_WRITERS) { |
2932 | DPRINTK(DRIVER_NAME": dev not setup\n"); |
2933 | ret = -ENXIO; |
2934 | goto out; |
2935 | } |
2936 | |
2937 | if (pd->refcnt > 0) { |
2938 | ret = -EBUSY; |
2939 | goto out; |
2940 | } |
2941 | if (!IS_ERR(pd->cdrw.thread)) |
2942 | kthread_stop(pd->cdrw.thread); |
2943 | |
2944 | pkt_devs[idx] = NULL; |
2945 | |
2946 | pkt_debugfs_dev_remove(pd); |
2947 | pkt_sysfs_dev_remove(pd); |
2948 | |
2949 | blkdev_put(pd->bdev, FMODE_READ | FMODE_NDELAY); |
2950 | |
2951 | remove_proc_entry(pd->name, pkt_proc); |
2952 | DPRINTK(DRIVER_NAME": writer %s unmapped\n", pd->name); |
2953 | |
2954 | del_gendisk(pd->disk); |
2955 | blk_cleanup_queue(pd->disk->queue); |
2956 | put_disk(pd->disk); |
2957 | |
2958 | mempool_destroy(pd->rb_pool); |
2959 | kfree(pd); |
2960 | |
2961 | /* This is safe: open() is still holding a reference. */ |
2962 | module_put(THIS_MODULE); |
2963 | |
2964 | out: |
2965 | mutex_unlock(&ctl_mutex); |
2966 | return ret; |
2967 | } |
2968 | |
2969 | static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd) |
2970 | { |
2971 | struct pktcdvd_device *pd; |
2972 | |
2973 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
2974 | |
2975 | pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index); |
2976 | if (pd) { |
2977 | ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev); |
2978 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); |
2979 | } else { |
2980 | ctrl_cmd->dev = 0; |
2981 | ctrl_cmd->pkt_dev = 0; |
2982 | } |
2983 | ctrl_cmd->num_devices = MAX_WRITERS; |
2984 | |
2985 | mutex_unlock(&ctl_mutex); |
2986 | } |
2987 | |
2988 | static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
2989 | { |
2990 | void __user *argp = (void __user *)arg; |
2991 | struct pkt_ctrl_command ctrl_cmd; |
2992 | int ret = 0; |
2993 | dev_t pkt_dev = 0; |
2994 | |
2995 | if (cmd != PACKET_CTRL_CMD) |
2996 | return -ENOTTY; |
2997 | |
2998 | if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command))) |
2999 | return -EFAULT; |
3000 | |
3001 | switch (ctrl_cmd.command) { |
3002 | case PKT_CTRL_CMD_SETUP: |
3003 | if (!capable(CAP_SYS_ADMIN)) |
3004 | return -EPERM; |
3005 | ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev); |
3006 | ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev); |
3007 | break; |
3008 | case PKT_CTRL_CMD_TEARDOWN: |
3009 | if (!capable(CAP_SYS_ADMIN)) |
3010 | return -EPERM; |
3011 | ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev)); |
3012 | break; |
3013 | case PKT_CTRL_CMD_STATUS: |
3014 | pkt_get_status(&ctrl_cmd); |
3015 | break; |
3016 | default: |
3017 | return -ENOTTY; |
3018 | } |
3019 | |
3020 | if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command))) |
3021 | return -EFAULT; |
3022 | return ret; |
3023 | } |
3024 | |
3025 | #ifdef CONFIG_COMPAT |
3026 | static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
3027 | { |
3028 | return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); |
3029 | } |
3030 | #endif |
3031 | |
3032 | static const struct file_operations pkt_ctl_fops = { |
3033 | .open = nonseekable_open, |
3034 | .unlocked_ioctl = pkt_ctl_ioctl, |
3035 | #ifdef CONFIG_COMPAT |
3036 | .compat_ioctl = pkt_ctl_compat_ioctl, |
3037 | #endif |
3038 | .owner = THIS_MODULE, |
3039 | }; |
3040 | |
3041 | static struct miscdevice pkt_misc = { |
3042 | .minor = MISC_DYNAMIC_MINOR, |
3043 | .name = DRIVER_NAME, |
3044 | .nodename = "pktcdvd/control", |
3045 | .fops = &pkt_ctl_fops |
3046 | }; |
3047 | |
3048 | static int __init pkt_init(void) |
3049 | { |
3050 | int ret; |
3051 | |
3052 | mutex_init(&ctl_mutex); |
3053 | |
3054 | psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE, |
3055 | sizeof(struct packet_stacked_data)); |
3056 | if (!psd_pool) |
3057 | return -ENOMEM; |
3058 | |
3059 | ret = register_blkdev(pktdev_major, DRIVER_NAME); |
3060 | if (ret < 0) { |
3061 | printk(DRIVER_NAME": Unable to register block device\n"); |
3062 | goto out2; |
3063 | } |
3064 | if (!pktdev_major) |
3065 | pktdev_major = ret; |
3066 | |
3067 | ret = pkt_sysfs_init(); |
3068 | if (ret) |
3069 | goto out; |
3070 | |
3071 | pkt_debugfs_init(); |
3072 | |
3073 | ret = misc_register(&pkt_misc); |
3074 | if (ret) { |
3075 | printk(DRIVER_NAME": Unable to register misc device\n"); |
3076 | goto out_misc; |
3077 | } |
3078 | |
3079 | pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL); |
3080 | |
3081 | return 0; |
3082 | |
3083 | out_misc: |
3084 | pkt_debugfs_cleanup(); |
3085 | pkt_sysfs_cleanup(); |
3086 | out: |
3087 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
3088 | out2: |
3089 | mempool_destroy(psd_pool); |
3090 | return ret; |
3091 | } |
3092 | |
3093 | static void __exit pkt_exit(void) |
3094 | { |
3095 | remove_proc_entry("driver/"DRIVER_NAME, NULL); |
3096 | misc_deregister(&pkt_misc); |
3097 | |
3098 | pkt_debugfs_cleanup(); |
3099 | pkt_sysfs_cleanup(); |
3100 | |
3101 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
3102 | mempool_destroy(psd_pool); |
3103 | } |
3104 | |
3105 | MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives"); |
3106 | MODULE_AUTHOR("Jens Axboe <axboe@suse.de>"); |
3107 | MODULE_LICENSE("GPL"); |
3108 | |
3109 | module_init(pkt_init); |
3110 | module_exit(pkt_exit); |
3111 |
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